21962004 has 48 divisors (see below), whose sum is σ = 52617600. Its totient is φ = 7127680.

The previous prime is 21961993. The next prime is 21962021. The reversal of 21962004 is 40026912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126862 + ... + 127034.

It is an arithmetic number, because the mean of its divisors is an integer number (1096200).

Almost surely, 2^21962004 is an apocalyptic number.

It is an amenable number.

21962004 is an abundant number, since it is smaller than the sum of its proper divisors (30655596).

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

21962004 is a wasteful number, since it uses less digits than its factorization.

21962004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21962004 is about 4686.3636222555. The cubic root of 21962004 is about 280.0425275540.

Adding to 21962004 its reverse (40026912), we get a palindrome (61988916).

The spelling of 21962004 in words is "twenty-one million, nine hundred sixty-two thousand, four".