21431331052 has 6 divisors (see below), whose sum is σ = 37504829348. Its totient is φ = 10715665524.

The previous prime is 21431331037. The next prime is 21431331109. The reversal of 21431331052 is 25013313412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678916378 + ... + 2678916385.

Almost surely, 2^21431331052 is an apocalyptic number.

It is an amenable number.

21431331052 is a deficient number, since it is larger than the sum of its proper divisors (16073498296).

21431331052 is a wasteful number, since it uses less digits than its factorization.

21431331052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357832767 (or 5357832765 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21431331052 its reverse (25013313412), we get a palindrome (46444644464).

The spelling of 21431331052 in words is "twenty-one billion, four hundred thirty-one million, three hundred thirty-one thousand, fifty-two".