121557002052 has 24 divisors (see below), whose sum is σ = 283638801600. Its totient is φ = 40518172576.

The previous prime is 121557002051. The next prime is 121557002053. The reversal of 121557002052 is 250200755121.

It is an interprime number because it is at equal distance from previous prime (121557002051) and next prime (121557002053).

It is a super-2 number, since 2×121557002052² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121557002051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887974 + ... + 1015682.

It is an arithmetic number, because the mean of its divisors is an integer number (11818283400).

Almost surely, 2^121557002052 is an apocalyptic number.

121557002052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121557002052 is an abundant number, since it is smaller than the sum of its proper divisors (162081799548).

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

121557002052 is a wasteful number, since it uses less digits than its factorization.

121557002052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207035 (or 207033 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 30.

Adding to 121557002052 its reverse (250200755121), we get a palindrome (371757757173).

The spelling of 121557002052 in words is "one hundred twenty-one billion, five hundred fifty-seven million, two thousand, fifty-two".