21460658 has 4 divisors (see below), whose sum is σ = 32190990. Its totient is φ = 10730328.

The previous prime is 21460657. The next prime is 21460697. The reversal of 21460658 is 85606412.

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

It can be written as a sum of positive squares in only one way, i.e., 21409129 + 51529 = 4627^2 + 227^2 .

It is not an unprimeable number, because it can be changed into a prime (21460657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5365163 + ... + 5365166.

Almost surely, 2^21460658 is an apocalyptic number.

21460658 is a deficient number, since it is larger than the sum of its proper divisors (10730332).

21460658 is a wasteful number, since it uses less digits than its factorization.

21460658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10730331.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 21460658 is about 4632.5649482765. The cubic root of 21460658 is about 277.8951781200.

The spelling of 21460658 in words is "twenty-one million, four hundred sixty thousand, six hundred fifty-eight".