21614420 has 24 divisors (see below), whose sum is σ = 45493224. Its totient is φ = 8626176.

The previous prime is 21614399. The next prime is 21614431. The reversal of 21614420 is 2441612.

It can be written as a sum of positive squares in 4 ways, for example, as 2709316 + 18905104 = 1646^2 + 4348^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21614392 and 21614401.

It is a congruent number.

It is an unprimeable number.

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, 10604 + ... + 12476.

It is an arithmetic number, because the mean of its divisors is an integer number (1895551).

Almost surely, 2^21614420 is an apocalyptic number.

21614420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21614420 is an abundant number, since it is smaller than the sum of its proper divisors (23878804).

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

21614420 is a wasteful number, since it uses less digits than its factorization.

21614420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459 (or 2457 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21614420 is about 4649.1311016146. The cubic root of 21614420 is about 278.5572900373.

The spelling of 21614420 in words is "twenty-one million, six hundred fourteen thousand, four hundred twenty".