21359388 has 24 divisors (see below), whose sum is σ = 50471680. Its totient is φ = 7029360.

The previous prime is 21359383. The next prime is 21359389. The reversal of 21359388 is 88395312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10318 + ... + 12213.

Almost surely, 2^21359388 is an apocalyptic number.

It is an amenable number.

21359388 is an abundant number, since it is smaller than the sum of its proper divisors (29112292).

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

21359388 is a wasteful number, since it uses less digits than its factorization.

21359388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22617 (or 22615 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 21359388 is about 4621.6217932669. The cubic root of 21359388 is about 277.4573719116.

The spelling of 21359388 in words is "twenty-one million, three hundred fifty-nine thousand, three hundred eighty-eight".