21764614 has 16 divisors (see below), whose sum is σ = 34458480. Its totient is φ = 10281600.

The previous prime is 21764599. The next prime is 21764623. The reversal of 21764614 is 41646712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22362 + ... + 23314.

It is an arithmetic number, because the mean of its divisors is an integer number (2153655).

Almost surely, 2^21764614 is an apocalyptic number.

21764614 is a deficient number, since it is larger than the sum of its proper divisors (12693866).

21764614 is a wasteful number, since it uses less digits than its factorization.

21764614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575.

The product of its digits is 8064, while the sum is 31.

The square root of 21764614 is about 4665.2560487073. The cubic root of 21764614 is about 279.2010130559.

The spelling of 21764614 in words is "twenty-one million, seven hundred sixty-four thousand, six hundred fourteen".