121671557020 has 144 divisors (see below), whose sum is σ = 288013713120. Its totient is φ = 42877029888.

The previous prime is 121671557017. The next prime is 121671557027. The reversal of 121671557020 is 20755176121.

It is a super-2 number, since 2×121671557020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121671557027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 262789309 + ... + 262789771.

It is an arithmetic number, because the mean of its divisors is an integer number (2000095230).

Almost surely, 2^121671557020 is an apocalyptic number.

121671557020 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 121671557020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144006856560).

121671557020 is an abundant number, since it is smaller than the sum of its proper divisors (166342156100).

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

121671557020 is a wasteful number, since it uses less digits than its factorization.

121671557020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 121671557020 in words is "one hundred twenty-one billion, six hundred seventy-one million, five hundred fifty-seven thousand, twenty".