21367954 has 16 divisors (see below), whose sum is σ = 33266520. Its totient is φ = 10281600.

The previous prime is 21367933. The next prime is 21367979. The reversal of 21367954 is 45976312.

It can be written as a sum of positive squares in 4 ways, for example, as 15389929 + 5978025 = 3923^2 + 2445^2 .

It is a super-2 number, since 2×21367954² = 913178916292232, which contains 22 as substring.

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, 34552 + ... + 35164.

Almost surely, 2^21367954 is an apocalyptic number.

21367954 is a deficient number, since it is larger than the sum of its proper divisors (11898566).

21367954 is a wasteful number, since it uses less digits than its factorization.

21367954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245.

The product of its digits is 45360, while the sum is 37.

The square root of 21367954 is about 4622.5484313309. The cubic root of 21367954 is about 277.4944575902.

The spelling of 21367954 in words is "twenty-one million, three hundred sixty-seven thousand, nine hundred fifty-four".