21650770 has 8 divisors (see below), whose sum is σ = 38971404. Its totient is φ = 8660304.

The previous prime is 21650753. The next prime is 21650789. The reversal of 21650770 is 7705612.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 361 = 4653^2 + 19^2 .

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, 1082529 + ... + 1082548.

Almost surely, 2^21650770 is an apocalyptic number.

21650770 is a deficient number, since it is larger than the sum of its proper divisors (17320634).

21650770 is a wasteful number, since it uses less digits than its factorization.

21650770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165084.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 21650770 is about 4653.0387920154. The cubic root of 21650770 is about 278.7133569373.

The spelling of 21650770 in words is "twenty-one million, six hundred fifty thousand, seven hundred seventy".