21893815246 has 16 divisors (see below), whose sum is σ = 33029735904. Its totient is φ = 10883978784.

The previous prime is 21893815231. The next prime is 21893815261. The reversal of 21893815246 is 64251839812.

It is an interprime number because it is at equal distance from previous prime (21893815231) and next prime (21893815261).

It is a self number, because there is not a number n which added to its sum of digits gives 21893815246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589936 + ... + 625948.

It is an arithmetic number, because the mean of its divisors is an integer number (2064358494).

Almost surely, 2^21893815246 is an apocalyptic number.

21893815246 is a deficient number, since it is larger than the sum of its proper divisors (11135920658).

21893815246 is a wasteful number, since it uses less digits than its factorization.

21893815246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37755.

The product of its digits is 829440, while the sum is 49.

The spelling of 21893815246 in words is "twenty-one billion, eight hundred ninety-three million, eight hundred fifteen thousand, two hundred forty-six".