121025400552 has 48 divisors (see below), whose sum is σ = 374602431840. Its totient is φ = 34578685728.

The previous prime is 121025400547. The next prime is 121025400583. The reversal of 121025400552 is 255004520121.

121025400552 is a `hidden beast` number, since 1 + 2 + 102 + 5 + 4 + 0 + 0 + 552 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120064378 + ... + 120065385.

It is an arithmetic number, because the mean of its divisors is an integer number (7804217330).

Almost surely, 2^121025400552 is an apocalyptic number.

121025400552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121025400552 is an abundant number, since it is smaller than the sum of its proper divisors (253577031288).

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

121025400552 is a wasteful number, since it uses less digits than its factorization.

121025400552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240129782 (or 240129775 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 121025400552 its reverse (255004520121), we get a palindrome (376029920673).

The spelling of 121025400552 in words is "one hundred twenty-one billion, twenty-five million, four hundred thousand, five hundred fifty-two".