21374997 has 8 divisors (see below), whose sum is σ = 32571456. Its totient is φ = 12214272.

The previous prime is 21374971. The next prime is 21375007. The reversal of 21374997 is 79947312.

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

It is not a de Polignac number, because 21374997 - 2¹² = 21370901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374957) 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, 508908 + ... + 508949.

It is an arithmetic number, because the mean of its divisors is an integer number (4071432).

Almost surely, 2^21374997 is an apocalyptic number.

It is an amenable number.

21374997 is a deficient number, since it is larger than the sum of its proper divisors (11196459).

21374997 is a wasteful number, since it uses less digits than its factorization.

21374997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017867.

The product of its digits is 95256, while the sum is 42.

The square root of 21374997 is about 4623.3101777839. The cubic root of 21374997 is about 277.5249421620.

The spelling of 21374997 in words is "twenty-one million, three hundred seventy-four thousand, nine hundred ninety-seven".