21349236 has 24 divisors (see below), whose sum is σ = 52437280. Its totient is φ = 6741792.

The previous prime is 21349219. The next prime is 21349243. The reversal of 21349236 is 63294312.

It is a congruent number.

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, 46591 + ... + 47046.

Almost surely, 2^21349236 is an apocalyptic number.

It is an amenable number.

21349236 is an abundant number, since it is smaller than the sum of its proper divisors (31088044).

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

21349236 is a wasteful number, since it uses less digits than its factorization.

21349236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93663 (or 93661 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 21349236 is about 4620.5233469814. The cubic root of 21349236 is about 277.4134069562.

The spelling of 21349236 in words is "twenty-one million, three hundred forty-nine thousand, two hundred thirty-six".