21421288924 has 48 divisors (see below), whose sum is σ = 45271296000. Its totient is φ = 8670220416.

The previous prime is 21421288913. The next prime is 21421288927. The reversal of 21421288924 is 42988212412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421288927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159649 + ... + 261400.

It is an arithmetic number, because the mean of its divisors is an integer number (943152000).

Almost surely, 2^21421288924 is an apocalyptic number.

It is an amenable number.

21421288924 is an abundant number, since it is smaller than the sum of its proper divisors (23850007076).

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

21421288924 is a wasteful number, since it uses less digits than its factorization.

21421288924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421162 (or 421160 counting only the distinct ones).

The product of its digits is 147456, while the sum is 43.

The spelling of 21421288924 in words is "twenty-one billion, four hundred twenty-one million, two hundred eighty-eight thousand, nine hundred twenty-four".