21253358 has 24 divisors (see below), whose sum is σ = 37379232. Its totient is φ = 9036384.

The previous prime is 21253339. The next prime is 21253361. The reversal of 21253358 is 85335212.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21253358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12635 + ... + 14217.

It is an arithmetic number, because the mean of its divisors is an integer number (1557468).

Almost surely, 2^21253358 is an apocalyptic number.

21253358 is a deficient number, since it is larger than the sum of its proper divisors (16125874).

21253358 is a wasteful number, since it uses less digits than its factorization.

21253358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 1729 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

The square root of 21253358 is about 4610.1364404972. The cubic root of 21253358 is about 276.9975020084.

The spelling of 21253358 in words is "twenty-one million, two hundred fifty-three thousand, three hundred fifty-eight".