21266974 has 4 divisors (see below), whose sum is σ = 31900464. Its totient is φ = 10633486.

The previous prime is 21266953. The next prime is 21266977. The reversal of 21266974 is 47966212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5316742 + ... + 5316745.

It is an arithmetic number, because the mean of its divisors is an integer number (7975116).

Almost surely, 2^21266974 is an apocalyptic number.

21266974 is a deficient number, since it is larger than the sum of its proper divisors (10633490).

21266974 is a wasteful number, since it uses less digits than its factorization.

21266974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10633489.

The product of its digits is 36288, while the sum is 37.

The square root of 21266974 is about 4611.6129499341. The cubic root of 21266974 is about 277.0566423546.

The spelling of 21266974 in words is "twenty-one million, two hundred sixty-six thousand, nine hundred seventy-four".