21754930 has 16 divisors (see below), whose sum is σ = 40509720. Its totient is φ = 8401792.

The previous prime is 21754891. The next prime is 21754961. The reversal of 21754930 is 3945712.

It can be written as a sum of positive squares in 4 ways, for example, as 15000129 + 6754801 = 3873^2 + 2599^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21754892 and 21754901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37219 + ... + 37798.

Almost surely, 2^21754930 is an apocalyptic number.

21754930 is a deficient number, since it is larger than the sum of its proper divisors (18754790).

21754930 is a wasteful number, since it uses less digits than its factorization.

21754930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75053.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21754930 is about 4664.2180480762. The cubic root of 21754930 is about 279.1595974547.

The spelling of 21754930 in words is "twenty-one million, seven hundred fifty-four thousand, nine hundred thirty".