21712974 has 32 divisors (see below), whose sum is σ = 44595360. Its totient is φ = 7045632.

The previous prime is 21712973. The next prime is 21712981. The reversal of 21712974 is 47921712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21712973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38704 + ... + 39260.

It is an arithmetic number, because the mean of its divisors is an integer number (1393605).

Almost surely, 2^21712974 is an apocalyptic number.

21712974 is an abundant number, since it is smaller than the sum of its proper divisors (22882386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21712974 is a wasteful number, since it uses less digits than its factorization.

21712974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its digits is 7056, while the sum is 33.

The square root of 21712974 is about 4659.7182318248. The cubic root of 21712974 is about 278.9800219505.

The spelling of 21712974 in words is "twenty-one million, seven hundred twelve thousand, nine hundred seventy-four".