21265802 has 4 divisors (see below), whose sum is σ = 31898706. Its totient is φ = 10632900.

The previous prime is 21265789. The next prime is 21265817. The reversal of 21265802 is 20856212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17986081 + 3279721 = 4241^2 + 1811^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5316449 + ... + 5316452.

Almost surely, 2^21265802 is an apocalyptic number.

21265802 is a deficient number, since it is larger than the sum of its proper divisors (10632904).

21265802 is a wasteful number, since it uses less digits than its factorization.

21265802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632903.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 21265802 is about 4611.4858776754. The cubic root of 21265802 is about 277.0515528302.

The spelling of 21265802 in words is "twenty-one million, two hundred sixty-five thousand, eight hundred two".