21404434002 has 64 divisors (see below), whose sum is σ = 51519283200. Its totient is φ = 5791443840.

The previous prime is 21404433991. The next prime is 21404434027. The reversal of 21404434002 is 20043440412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4051999 + ... + 4057277.

It is an arithmetic number, because the mean of its divisors is an integer number (804988800).

Almost surely, 2^21404434002 is an apocalyptic number.

21404434002 is an abundant number, since it is smaller than the sum of its proper divisors (30114849198).

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

21404434002 is a wasteful number, since it uses less digits than its factorization.

21404434002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10391.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21404434002 its reverse (20043440412), we get a palindrome (41447874414).

The spelling of 21404434002 in words is "twenty-one billion, four hundred four million, four hundred thirty-four thousand, two".