21156023462 has 16 divisors (see below), whose sum is σ = 36951761952. Its totient is φ = 8895793920.

The previous prime is 21156023437. The next prime is 21156023513. The reversal of 21156023462 is 26432065112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14255339 + ... + 14256822.

It is an arithmetic number, because the mean of its divisors is an integer number (2309485122).

Almost surely, 2^21156023462 is an apocalyptic number.

21156023462 is a deficient number, since it is larger than the sum of its proper divisors (15795738490).

21156023462 is a wasteful number, since it uses less digits than its factorization.

21156023462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28512223.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 21156023462 its reverse (26432065112), we get a palindrome (47588088574).

The spelling of 21156023462 in words is "twenty-one billion, one hundred fifty-six million, twenty-three thousand, four hundred sixty-two".