21930514 has 8 divisors (see below), whose sum is σ = 33346620. Its totient is φ = 10814976.

The previous prime is 21930511. The next prime is 21930553. The reversal of 21930514 is 41503912.

It can be written as a sum of positive squares in 2 ways, for example, as 21930489 + 25 = 4683^2 + 5^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21930511) 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, 74959 + ... + 75250.

Almost surely, 2^21930514 is an apocalyptic number.

21930514 is a deficient number, since it is larger than the sum of its proper divisors (11416106).

21930514 is a wasteful number, since it uses less digits than its factorization.

21930514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150284.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21930514 is about 4683.0026692284. The cubic root of 21930514 is about 279.9086181387.

Subtracting from 21930514 its sum of digits (25), we obtain a square (21930489 = 4683²).

The spelling of 21930514 in words is "twenty-one million, nine hundred thirty thousand, five hundred fourteen".