21265346 has 4 divisors (see below), whose sum is σ = 31898022. Its totient is φ = 10632672.

The previous prime is 21265337. The next prime is 21265373. The reversal of 21265346 is 64356212.

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., 21114025 + 151321 = 4595^2 + 389^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5316335 + ... + 5316338.

Almost surely, 2^21265346 is an apocalyptic number.

21265346 is a deficient number, since it is larger than the sum of its proper divisors (10632676).

21265346 is a wasteful number, since it uses less digits than its factorization.

21265346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632675.

The product of its digits is 8640, while the sum is 29.

The square root of 21265346 is about 4611.4364356456. The cubic root of 21265346 is about 277.0495725551.

The spelling of 21265346 in words is "twenty-one million, two hundred sixty-five thousand, three hundred forty-six".