121525221000 has 128 divisors (see below), whose sum is σ = 387226344960. Its totient is φ = 31717184000.

The previous prime is 121525220981. The next prime is 121525221019. The reversal of 121525221000 is 122525121.

It is an interprime number because it is at equal distance from previous prime (121525220981) and next prime (121525221019).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289941 + ... + 571940.

It is an arithmetic number, because the mean of its divisors is an integer number (3025205820).

Almost surely, 2^121525221000 is an apocalyptic number.

121525221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121525221000 is an abundant number, since it is smaller than the sum of its proper divisors (265701123960).

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

121525221000 is a wasteful number, since it uses less digits than its factorization.

121525221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861952 (or 861938 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 121525221000 its reverse (122525121), we get a palindrome (121647746121).

The spelling of 121525221000 in words is "one hundred twenty-one billion, five hundred twenty-five million, two hundred twenty-one thousand".