21870914 has 8 divisors (see below), whose sum is σ = 35329980. Its totient is φ = 10094256.

The previous prime is 21870883. The next prime is 21870931. The reversal of 21870914 is 41907812.

It can be written as a sum of positive squares in 2 ways, for example, as 15342889 + 6528025 = 3917^2 + 2555^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420569 + ... + 420620.

Almost surely, 2^21870914 is an apocalyptic number.

21870914 is a deficient number, since it is larger than the sum of its proper divisors (13459066).

21870914 is a wasteful number, since it uses less digits than its factorization.

21870914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841204.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21870914 is about 4676.6349012939. The cubic root of 21870914 is about 279.6548212436.

The spelling of 21870914 in words is "twenty-one million, eight hundred seventy thousand, nine hundred fourteen".