21404682 has 32 divisors (see below), whose sum is σ = 51226560. Its totient is φ = 6585840.

The previous prime is 21404681. The next prime is 21404689. The reversal of 21404682 is 28640412.

It is a super-3 number, since 3×21404682³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21404681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14544 + ... + 15947.

It is an arithmetic number, because the mean of its divisors is an integer number (1600830).

Almost surely, 2^21404682 is an apocalyptic number.

21404682 is an abundant number, since it is smaller than the sum of its proper divisors (29821878).

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

21404682 is a wasteful number, since it uses less digits than its factorization.

21404682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30515 (or 30509 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21404682 is about 4626.5194260913. The cubic root of 21404682 is about 277.6533557024.

The spelling of 21404682 in words is "twenty-one million, four hundred four thousand, six hundred eighty-two".