21792091 has 2 divisors, whose sum is σ = 21792092. Its totient is φ = 21792090.

The previous prime is 21792083. The next prime is 21792103. The reversal of 21792091 is 19029712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21792091 - 2³ = 21792083 is a prime.

It is a super-3 number, since 3×21792091³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21792061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10896045 + 10896046.

It is an arithmetic number, because the mean of its divisors is an integer number (10896046).

Almost surely, 2^21792091 is an apocalyptic number.

21792091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21792091 is an equidigital number, since it uses as much as digits as its factorization.

21792091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 21792091 is about 4668.1999742942. The cubic root of 21792091 is about 279.3184572113.

The spelling of 21792091 in words is "twenty-one million, seven hundred ninety-two thousand, ninety-one".