21404962 has 4 divisors (see below), whose sum is σ = 32107446. Its totient is φ = 10702480.

The previous prime is 21404941. The next prime is 21404983. The reversal of 21404962 is 26940412.

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

It is an interprime number because it is at equal distance from previous prime (21404941) and next prime (21404983).

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 143641 = 4611^2 + 379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21404962.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5351239 + ... + 5351242.

Almost surely, 2^21404962 is an apocalyptic number.

21404962 is a deficient number, since it is larger than the sum of its proper divisors (10702484).

21404962 is a wasteful number, since it uses less digits than its factorization.

21404962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10702483.

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

The square root of 21404962 is about 4626.5496863213. The cubic root of 21404962 is about 277.6545663815.

It can be divided in two parts, 21404 and 962, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 21404962 in words is "twenty-one million, four hundred four thousand, nine hundred sixty-two".