21904462 has 4 divisors (see below), whose sum is σ = 32856696. Its totient is φ = 10952230.

The previous prime is 21904459. The next prime is 21904469. The reversal of 21904462 is 26440912.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21904462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21904469) by changing a digit.

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 as a sum of consecutive naturals, namely, 5476114 + ... + 5476117.

It is an arithmetic number, because the mean of its divisors is an integer number (8214174).

Almost surely, 2^21904462 is an apocalyptic number.

21904462 is a deficient number, since it is larger than the sum of its proper divisors (10952234).

21904462 is a wasteful number, since it uses less digits than its factorization.

21904462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952233.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21904462 is about 4680.2202939605. The cubic root of 21904462 is about 279.7977365793.

It can be divided in two parts, 21904 and 462, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 21904462 in words is "twenty-one million, nine hundred four thousand, four hundred sixty-two".