120021012540 has 144 divisors (see below), whose sum is σ = 427711336416. Its totient is φ = 26857843200.

The previous prime is 120021012511. The next prime is 120021012541. The reversal of 120021012540 is 45210120021.

120021012540 is a `hidden beast` number, since 1 + 20 + 0 + 2 + 101 + 2 + 540 = 666.

It is a super-2 number, since 2×120021012540² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021012541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2305671 + ... + 2357150.

It is an arithmetic number, because the mean of its divisors is an integer number (2970217614).

Almost surely, 2^120021012540 is an apocalyptic number.

120021012540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120021012540 is an abundant number, since it is smaller than the sum of its proper divisors (307690323876).

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

120021012540 is a wasteful number, since it uses less digits than its factorization.

120021012540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662860 (or 4662855 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 120021012540 its reverse (45210120021), we get a palindrome (165231132561).

The spelling of 120021012540 in words is "one hundred twenty billion, twenty-one million, twelve thousand, five hundred forty".