121354004520 has 512 divisors, whose sum is σ = 480607948800. Its totient is φ = 26658118656.

The previous prime is 121354004383. The next prime is 121354004521. The reversal of 121354004520 is 25400453121.

121354004520 is a `hidden beast` number, since 1 + 2 + 135 + 4 + 0 + 0 + 4 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121354004521) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23214147 + ... + 23219373.

It is an arithmetic number, because the mean of its divisors is an integer number (938687400).

Almost surely, 2^121354004520 is an apocalyptic number.

121354004520 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 121354004520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240303974400).

121354004520 is an abundant number, since it is smaller than the sum of its proper divisors (359253944280).

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

121354004520 is a wasteful number, since it uses less digits than its factorization.

121354004520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374 (or 5364 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 121354004520 its reverse (25400453121), we get a palindrome (146754457641).

The spelling of 121354004520 in words is "one hundred twenty-one billion, three hundred fifty-four million, four thousand, five hundred twenty".