21040014120 has 32 divisors (see below), whose sum is σ = 63120042720. Its totient is φ = 5610670400.

The previous prime is 21040014109. The next prime is 21040014133. The reversal of 21040014120 is 2141004012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21040014120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87666606 + ... + 87666845.

It is an arithmetic number, because the mean of its divisors is an integer number (1972501335).

Almost surely, 2^21040014120 is an apocalyptic number.

21040014120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040014120 is an abundant number, since it is smaller than the sum of its proper divisors (42080028600).

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

21040014120 is a wasteful number, since it uses less digits than its factorization.

21040014120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175333465 (or 175333461 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21040014120 its reverse (2141004012), we get a palindrome (23181018132).

The spelling of 21040014120 in words is "twenty-one billion, forty million, fourteen thousand, one hundred twenty".