21293996511 has 8 divisors (see below), whose sum is σ = 28643252400. Its totient is φ = 14070369152.

The previous prime is 21293996497. The next prime is 21293996533. The reversal of 21293996511 is 11569939212.

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

It is a cyclic number.

It is not a de Polignac number, because 21293996511 - 2¹⁹ = 21293472223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21293996411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31406736 + ... + 31407413.

It is an arithmetic number, because the mean of its divisors is an integer number (3580406550).

Almost surely, 2^21293996511 is an apocalyptic number.

21293996511 is a deficient number, since it is larger than the sum of its proper divisors (7349255889).

21293996511 is a wasteful number, since it uses less digits than its factorization.

21293996511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62814265.

The product of its digits is 262440, while the sum is 48.

The spelling of 21293996511 in words is "twenty-one billion, two hundred ninety-three million, nine hundred ninety-six thousand, five hundred eleven".