21367474 has 16 divisors (see below), whose sum is σ = 32934528. Its totient is φ = 10391472.

The previous prime is 21367433. The next prime is 21367481. The reversal of 21367474 is 47476312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31224 + ... + 31900.

It is an arithmetic number, because the mean of its divisors is an integer number (2058408).

Almost surely, 2^21367474 is an apocalyptic number.

21367474 is a deficient number, since it is larger than the sum of its proper divisors (11567054).

21367474 is a wasteful number, since it uses less digits than its factorization.

21367474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089.

The product of its digits is 28224, while the sum is 34.

The square root of 21367474 is about 4622.4965116266. The cubic root of 21367474 is about 277.4923797383.

It can be divided in two parts, 213674 and 74, that multiplied together give a triangular number (15811876 = T₅₆₂₃).

The spelling of 21367474 in words is "twenty-one million, three hundred sixty-seven thousand, four hundred seventy-four".