21292671 has 8 divisors (see below), whose sum is σ = 28475824. Its totient is φ = 14152320.

The previous prime is 21292669. The next prime is 21292681. The reversal of 21292671 is 17629212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21292671 - 2¹ = 21292669 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 (21292631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9520 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (3559478).

Almost surely, 2^21292671 is an apocalyptic number.

21292671 is a deficient number, since it is larger than the sum of its proper divisors (7183153).

21292671 is a wasteful number, since it uses less digits than its factorization.

21292671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21401.

The product of its digits is 3024, while the sum is 30.

The square root of 21292671 is about 4614.3982272881. The cubic root of 21292671 is about 277.1681871210.

The spelling of 21292671 in words is "twenty-one million, two hundred ninety-two thousand, six hundred seventy-one".