21269530 has 16 divisors (see below), whose sum is σ = 38340864. Its totient is φ = 8495440.

The previous prime is 21269527. The next prime is 21269537. The reversal of 21269530 is 3596212.

It is not an unprimeable number, because it can be changed into a prime (21269537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9279 + ... + 11341.

It is an arithmetic number, because the mean of its divisors is an integer number (2396304).

Almost surely, 2^21269530 is an apocalyptic number.

21269530 is a deficient number, since it is larger than the sum of its proper divisors (17071334).

21269530 is a wasteful number, since it uses less digits than its factorization.

21269530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21269530 is about 4611.8900680740. The cubic root of 21269530 is about 277.0677413856.

The spelling of 21269530 in words is "twenty-one million, two hundred sixty-nine thousand, five hundred thirty".