21893769 has 12 divisors (see below), whose sum is σ = 32999616. Its totient is φ = 13961112.

The previous prime is 21893761. The next prime is 21893771. The reversal of 21893769 is 96739812.

It is not a de Polignac number, because 21893769 - 2³ = 21893761 is a prime.

It is a super-2 number, since 2×21893769² = 958674242050722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52677 + ... + 53090.

It is an arithmetic number, because the mean of its divisors is an integer number (2749968).

Almost surely, 2^21893769 is an apocalyptic number.

It is an amenable number.

21893769 is a deficient number, since it is larger than the sum of its proper divisors (11105847).

21893769 is a wasteful number, since it uses less digits than its factorization.

21893769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105796 (or 105793 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 21893769 is about 4679.0777937538. The cubic root of 21893769 is about 279.7521999793.

The spelling of 21893769 in words is "twenty-one million, eight hundred ninety-three thousand, seven hundred sixty-nine".