21095436 has 24 divisors (see below), whose sum is σ = 52118640. Its totient is φ = 6618112.

The previous prime is 21095429. The next prime is 21095461. The reversal of 21095436 is 63459012.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51501 + ... + 51908.

It is an arithmetic number, because the mean of its divisors is an integer number (2171610).

Almost surely, 2^21095436 is an apocalyptic number.

It is an amenable number.

21095436 is an abundant number, since it is smaller than the sum of its proper divisors (31023204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21095436 is a wasteful number, since it uses less digits than its factorization.

21095436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103433 (or 103431 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21095436 is about 4592.9768124823. The cubic root of 21095436 is about 276.3097237155.

The spelling of 21095436 in words is "twenty-one million, ninety-five thousand, four hundred thirty-six".