121623137753880 has 384 divisors, whose sum is σ = 446917385433600. Its totient is φ = 26328273979392.

The previous prime is 121623137753857. The next prime is 121623137753881. The reversal of 121623137753880 is 88357731326121.

It is a super-2 number, since 2×121623137753880² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 121623137753880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121623137753881) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 363704917 + ... + 364039163.

It is an arithmetic number, because the mean of its divisors is an integer number (1163847357900).

Almost surely, 2^{121623137753880} is an apocalyptic number.

121623137753880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121623137753880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223458692716800).

121623137753880 is an abundant number, since it is smaller than the sum of its proper divisors (325294247679720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121623137753880 is a wasteful number, since it uses less digits than its factorization.

121623137753880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337551 (or 337540 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 121623137753880 in words is "one hundred twenty-one trillion, six hundred twenty-three billion, one hundred thirty-seven million, seven hundred fifty-three thousand, eight hundred eighty".