21292911 has 6 divisors (see below), whose sum is σ = 30756440. Its totient is φ = 14195268.

The previous prime is 21292897. The next prime is 21292913. The reversal of 21292911 is 11929212.

It is not a de Polignac number, because 21292911 - 2⁶ = 21292847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1182931 + ... + 1182948.

Almost surely, 2^21292911 is an apocalyptic number.

21292911 is a deficient number, since it is larger than the sum of its proper divisors (9463529).

21292911 is a wasteful number, since it uses less digits than its factorization.

21292911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365885 (or 2365882 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 21292911 is about 4614.4242327727. The cubic root of 21292911 is about 277.1692284827.

The spelling of 21292911 in words is "twenty-one million, two hundred ninety-two thousand, nine hundred eleven".