21431441004 has 12 divisors (see below), whose sum is σ = 50006695704. Its totient is φ = 7143813664.

The previous prime is 21431440991. The next prime is 21431441033. The reversal of 21431441004 is 40014413412.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892976697 + ... + 892976720.

It is an arithmetic number, because the mean of its divisors is an integer number (4167224642).

Almost surely, 2^21431441004 is an apocalyptic number.

It is an amenable number.

21431441004 is an abundant number, since it is smaller than the sum of its proper divisors (28575254700).

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

21431441004 is a wasteful number, since it uses less digits than its factorization.

21431441004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785953424 (or 1785953422 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21431441004 its reverse (40014413412), we get a palindrome (61445854416).

The spelling of 21431441004 in words is "twenty-one billion, four hundred thirty-one million, four hundred forty-one thousand, four".