21602994 has 16 divisors (see below), whose sum is σ = 49378368. Its totient is φ = 6172272.

The previous prime is 21602969. The next prime is 21603007. The reversal of 21602994 is 49920612.

It is a Curzon number.

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 in 7 ways as a sum of consecutive naturals, for example, 257137 + ... + 257220.

It is an arithmetic number, because the mean of its divisors is an integer number (3086148).

Almost surely, 2^21602994 is an apocalyptic number.

21602994 is an abundant number, since it is smaller than the sum of its proper divisors (27775374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21602994 is a wasteful number, since it uses less digits than its factorization.

21602994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514369.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21602994 is about 4647.9021074029. The cubic root of 21602994 is about 278.5081969380.

The spelling of 21602994 in words is "twenty-one million, six hundred two thousand, nine hundred ninety-four".