21714690 has 16 divisors (see below), whose sum is σ = 52115328. Its totient is φ = 5790576.

The previous prime is 21714617. The next prime is 21714703. The reversal of 21714690 is 9641712.

It is a happy number.

It is a super-2 number, since 2×21714690² = 943055523592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 723823 = 21714690 / (2 + 1 + 7 + 1 + 4 + 6 + 9 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361882 + ... + 361941.

It is an arithmetic number, because the mean of its divisors is an integer number (3257208).

Almost surely, 2^21714690 is an apocalyptic number.

21714690 is an abundant number, since it is smaller than the sum of its proper divisors (30400638).

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

21714690 is a wasteful number, since it uses less digits than its factorization.

21714690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723833.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21714690 is about 4659.9023594921. The cubic root of 21714690 is about 278.9873711219.

The spelling of 21714690 in words is "twenty-one million, seven hundred fourteen thousand, six hundred ninety".