120021564440 has 64 divisors (see below), whose sum is σ = 271661765760. Its totient is φ = 47722268160.

The previous prime is 120021564431. The next prime is 120021564449. The reversal of 120021564440 is 44465120021.

It is an interprime number because it is at equal distance from previous prime (120021564431) and next prime (120021564449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021564449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9694094 + ... + 9706466.

It is an arithmetic number, because the mean of its divisors is an integer number (4244715090).

Almost surely, 2^120021564440 is an apocalyptic number.

120021564440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120021564440 is an abundant number, since it is smaller than the sum of its proper divisors (151640201320).

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

120021564440 is a wasteful number, since it uses less digits than its factorization.

120021564440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13812 (or 13808 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 120021564440 its reverse (44465120021), we get a palindrome (164486684461).

The spelling of 120021564440 in words is "one hundred twenty billion, twenty-one million, five hundred sixty-four thousand, four hundred forty".