21614790 has 32 divisors (see below), whose sum is σ = 53143776. Its totient is φ = 5623040.

The previous prime is 21614759. The next prime is 21614797. The reversal of 21614790 is 9741612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614797) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7557 + ... + 10016.

It is an arithmetic number, because the mean of its divisors is an integer number (1660743).

Almost surely, 2^21614790 is an apocalyptic number.

21614790 is an abundant number, since it is smaller than the sum of its proper divisors (31528986).

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

21614790 is a wasteful number, since it uses less digits than its factorization.

21614790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17624.

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

The square root of 21614790 is about 4649.1708938261. The cubic root of 21614790 is about 278.5588794948.

The spelling of 21614790 in words is "twenty-one million, six hundred fourteen thousand, seven hundred ninety".