21453004 has 12 divisors (see below), whose sum is σ = 38458728. Its totient is φ = 10464800.

The previous prime is 21452999. The next prime is 21453017. The reversal of 21453004 is 40035412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65242 + ... + 65569.

It is an arithmetic number, because the mean of its divisors is an integer number (3204894).

Almost surely, 2^21453004 is an apocalyptic number.

It is an amenable number.

21453004 is a deficient number, since it is larger than the sum of its proper divisors (17005724).

21453004 is a wasteful number, since it uses less digits than its factorization.

21453004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130856 (or 130854 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21453004 is about 4631.7387663814. The cubic root of 21453004 is about 277.8621368434.

Adding to 21453004 its reverse (40035412), we get a palindrome (61488416).

The spelling of 21453004 in words is "twenty-one million, four hundred fifty-three thousand, four".