21043470402 has 12 divisors (see below), whose sum is σ = 45594185910. Its totient is φ = 7014490128.

The previous prime is 21043470379. The next prime is 21043470403. The reversal of 21043470402 is 20407434012.

21043470402 is a `hidden beast` number, since 210 + 4 + 3 + 47 + 0 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21028190121 + 15280281 = 145011^2 + 3909^2 .

It is not an unprimeable number, because it can be changed into a prime (21043470403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 584540827 + ... + 584540862.

Almost surely, 2^21043470402 is an apocalyptic number.

21043470402 is an abundant number, since it is smaller than the sum of its proper divisors (24550715508).

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

21043470402 is a wasteful number, since it uses less digits than its factorization.

21043470402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169081697 (or 1169081694 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The spelling of 21043470402 in words is "twenty-one billion, forty-three million, four hundred seventy thousand, four hundred two".