21264104 has 8 divisors (see below), whose sum is σ = 39870210. Its totient is φ = 10632048.

The previous prime is 21264101. The next prime is 21264119. The reversal of 21264104 is 40146212.

It can be written as a sum of positive squares in only one way, i.e., 21141604 + 122500 = 4598^2 + 350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21264101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328999 + ... + 1329014.

Almost surely, 2^21264104 is an apocalyptic number.

It is an amenable number.

21264104 is a deficient number, since it is larger than the sum of its proper divisors (18606106).

21264104 is a wasteful number, since it uses less digits than its factorization.

21264104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658019 (or 2658015 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21264104 is about 4611.3017684814. The cubic root of 21264104 is about 277.0441787677.

The spelling of 21264104 in words is "twenty-one million, two hundred sixty-four thousand, one hundred four".