21092371 has 2 divisors, whose sum is σ = 21092372. Its totient is φ = 21092370.

The previous prime is 21092353. The next prime is 21092399. The reversal of 21092371 is 17329012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21092371 - 2⁵ = 21092339 is a prime.

It is a super-2 number, since 2×21092371² = 889776228803282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21092341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10546185 + 10546186.

It is an arithmetic number, because the mean of its divisors is an integer number (10546186).

Almost surely, 2^21092371 is an apocalyptic number.

21092371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21092371 is an equidigital number, since it uses as much as digits as its factorization.

21092371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21092371 is about 4592.6431387601. The cubic root of 21092371 is about 276.2963411949.

The spelling of 21092371 in words is "twenty-one million, ninety-two thousand, three hundred seventy-one".