21514967 has 4 divisors (see below), whose sum is σ = 21600936. Its totient is φ = 21429000.

The previous prime is 21514963. The next prime is 21514993. The reversal of 21514967 is 76941512.

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

It is a cyclic number.

It is not a de Polignac number, because 21514967 - 2² = 21514963 is a prime.

It is a super-2 number, since 2×21514967² = 925787610022178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42608 + ... + 43109.

It is an arithmetic number, because the mean of its divisors is an integer number (5400234).

Almost surely, 2^21514967 is an apocalyptic number.

21514967 is a deficient number, since it is larger than the sum of its proper divisors (85969).

21514967 is an equidigital number, since it uses as much as digits as its factorization.

21514967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85968.

The product of its digits is 15120, while the sum is 35.

The square root of 21514967 is about 4638.4229000814. The cubic root of 21514967 is about 278.1293973466.

The spelling of 21514967 in words is "twenty-one million, five hundred fourteen thousand, nine hundred sixty-seven".