21403674 has 12 divisors (see below), whose sum is σ = 46374666. Its totient is φ = 7134552.

The previous prime is 21403667. The next prime is 21403687. The reversal of 21403674 is 47630412.

It can be written as a sum of positive squares in only one way, i.e., 21095649 + 308025 = 4593^2 + 555^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594529 + ... + 594564.

Almost surely, 2^21403674 is an apocalyptic number.

21403674 is an abundant number, since it is smaller than the sum of its proper divisors (24970992).

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

21403674 is a wasteful number, since it uses less digits than its factorization.

21403674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189101 (or 1189098 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21403674 is about 4626.4104876243. The cubic root of 21403674 is about 277.6489971704.

The spelling of 21403674 in words is "twenty-one million, four hundred three thousand, six hundred seventy-four".