21792069 has 24 divisors (see below), whose sum is σ = 35686560. Its totient is φ = 12703392.

The previous prime is 21792061. The next prime is 21792073. The reversal of 21792069 is 96029712.

It is not a de Polignac number, because 21792069 - 2³ = 21792061 is a prime.

It is a super-2 number, since 2×21792069² = 949788542601522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21792061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2679 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (1486940).

Almost surely, 2^21792069 is an apocalyptic number.

It is an amenable number.

21792069 is a deficient number, since it is larger than the sum of its proper divisors (13894491).

21792069 is a wasteful number, since it uses less digits than its factorization.

21792069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9841 (or 9838 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21792069 is about 4668.1976179249. The cubic root of 21792069 is about 279.3183632168.

The spelling of 21792069 in words is "twenty-one million, seven hundred ninety-two thousand, sixty-nine".