21861614 has 4 divisors (see below), whose sum is σ = 32792424. Its totient is φ = 10930806.

The previous prime is 21861601. The next prime is 21861649. The reversal of 21861614 is 41616812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5465402 + ... + 5465405.

It is an arithmetic number, because the mean of its divisors is an integer number (8198106).

Almost surely, 2^21861614 is an apocalyptic number.

21861614 is a deficient number, since it is larger than the sum of its proper divisors (10930810).

21861614 is a wasteful number, since it uses less digits than its factorization.

21861614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10930809.

The product of its digits is 2304, while the sum is 29.

The square root of 21861614 is about 4675.6404908846. The cubic root of 21861614 is about 279.6151771366.

The spelling of 21861614 in words is "twenty-one million, eight hundred sixty-one thousand, six hundred fourteen".