121521121040000 has 160 divisors (see below), whose sum is σ = 330020986854240. Its totient is φ = 44189498240000.

The previous prime is 121521121039961. The next prime is 121521121040063. The reversal of 121521121040000 is 40121125121.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 68166092 + ... + 69926091.

It is an arithmetic number, because the mean of its divisors is an integer number (2062631167839).

Almost surely, 2^{121521121040000} is an apocalyptic number.

121521121040000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121521121040000 is an abundant number, since it is smaller than the sum of its proper divisors (208499865814240).

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

121521121040000 is an equidigital number, since it uses as much as digits as its factorization.

121521121040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138092228 (or 138092201 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 121521121040000 its reverse (40121125121), we get a palindrome (121561242165121).

The spelling of 121521121040000 in words is "one hundred twenty-one trillion, five hundred twenty-one billion, one hundred twenty-one million, forty thousand".