21314388 has 24 divisors (see below), whose sum is σ = 49863520. Its totient is φ = 7086240.

The previous prime is 21314387. The next prime is 21314393. The reversal of 21314388 is 88341312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314387) 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, 2943 + ... + 7161.

Almost surely, 2^21314388 is an apocalyptic number.

It is an amenable number.

21314388 is an abundant number, since it is smaller than the sum of its proper divisors (28549132).

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

21314388 is a wasteful number, since it uses less digits than its factorization.

21314388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647 (or 4645 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 21314388 is about 4616.7508054908. The cubic root of 21314388 is about 277.2623856721.

The spelling of 21314388 in words is "twenty-one million, three hundred fourteen thousand, three hundred eighty-eight".