21431052002 has 8 divisors (see below), whose sum is σ = 32309759196. Its totient is φ = 10661132272.

The previous prime is 21431052001. The next prime is 21431052031. The reversal of 21431052002 is 20025013412.

It can be written as a sum of positive squares in 2 ways, for example, as 19513575481 + 1917476521 = 139691^2 + 43789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21431052001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27196373 + ... + 27197160.

Almost surely, 2^21431052002 is an apocalyptic number.

21431052002 is a deficient number, since it is larger than the sum of its proper divisors (10878707194).

21431052002 is a wasteful number, since it uses less digits than its factorization.

21431052002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54393732.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21431052002 its reverse (20025013412), we get a palindrome (41456065414).

The spelling of 21431052002 in words is "twenty-one billion, four hundred thirty-one million, fifty-two thousand, two".