21936370 has 8 divisors (see below), whose sum is σ = 39485484. Its totient is φ = 8774544.

The previous prime is 21936349. The next prime is 21936389. The reversal of 21936370 is 7363912.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 1605289 = 4509^2 + 1267^2 .

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, 1096809 + ... + 1096828.

Almost surely, 2^21936370 is an apocalyptic number.

21936370 is a deficient number, since it is larger than the sum of its proper divisors (17549114).

21936370 is a wasteful number, since it uses less digits than its factorization.

21936370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193644.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 21936370 is about 4683.6278673695. The cubic root of 21936370 is about 279.9335301402.

The spelling of 21936370 in words is "twenty-one million, nine hundred thirty-six thousand, three hundred seventy".