21264435 has 12 divisors (see below), whose sum is σ = 36858432. Its totient is φ = 11341008.

The previous prime is 21264427. The next prime is 21264449. The reversal of 21264435 is 53446212.

21264435 is a `hidden beast` number, since 2 + 12 + 644 + 3 + 5 = 666.

It is not a de Polignac number, because 21264435 - 2³ = 21264427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21264399 and 21264408.

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 11 ways as a sum of consecutive naturals, for example, 236227 + ... + 236316.

It is an arithmetic number, because the mean of its divisors is an integer number (3071536).

Almost surely, 2^21264435 is an apocalyptic number.

21264435 is a deficient number, since it is larger than the sum of its proper divisors (15593997).

21264435 is a wasteful number, since it uses less digits than its factorization.

21264435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472554 (or 472551 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 21264435 is about 4611.3376584241. The cubic root of 21264435 is about 277.0456162630.

It can be divided in two parts, 2126 and 4435, that added together give a 8-th power (6561 = 3⁸).

The spelling of 21264435 in words is "twenty-one million, two hundred sixty-four thousand, four hundred thirty-five".