21493395 has 48 divisors (see below), whose sum is σ = 46455552. Its totient is φ = 8930880.

The previous prime is 21493387. The next prime is 21493441. The reversal of 21493395 is 59339412.

It is a happy number.

It is not a de Polignac number, because 21493395 - 2³ = 21493387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 364 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (967824).

Almost surely, 2^21493395 is an apocalyptic number.

21493395 is an abundant number, since it is smaller than the sum of its proper divisors (24962157).

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

21493395 is a wasteful number, since it uses less digits than its factorization.

21493395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232 (or 6229 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 21493395 is about 4636.0969575711. The cubic root of 21493395 is about 278.0364107029.

The spelling of 21493395 in words is "twenty-one million, four hundred ninety-three thousand, three hundred ninety-five".