21462730 has 16 divisors (see below), whose sum is σ = 39163464. Its totient is φ = 8467200.

The previous prime is 21462689. The next prime is 21462731. The reversal of 21462730 is 3726412.

It can be written as a sum of positive squares in 4 ways, for example, as 13549761 + 7912969 = 3681^2 + 2813^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21462695 and 21462704.

It is not an unprimeable number, because it can be changed into a prime (21462731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13971 + ... + 15430.

Almost surely, 2^21462730 is an apocalyptic number.

21462730 is a deficient number, since it is larger than the sum of its proper divisors (17700734).

21462730 is a wasteful number, since it uses less digits than its factorization.

21462730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29481.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21462730 is about 4632.7885770883. The cubic root of 21462730 is about 277.9041213108.

The spelling of 21462730 in words is "twenty-one million, four hundred sixty-two thousand, seven hundred thirty".