21514661 has 8 divisors (see below), whose sum is σ = 25052544. Its totient is φ = 18092880.

The previous prime is 21514657. The next prime is 21514667. The reversal of 21514661 is 16641512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21514661 - 2² = 21514657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21514661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28625 + ... + 29366.

It is an arithmetic number, because the mean of its divisors is an integer number (3131568).

Almost surely, 2^21514661 is an apocalyptic number.

It is an amenable number.

21514661 is a deficient number, since it is larger than the sum of its proper divisors (3537883).

21514661 is an equidigital number, since it uses as much as digits as its factorization.

21514661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58051.

The product of its digits is 1440, while the sum is 26.

The square root of 21514661 is about 4638.3899146148. The cubic root of 21514661 is about 278.1280787607.

The spelling of 21514661 in words is "twenty-one million, five hundred fourteen thousand, six hundred sixty-one".