21946130 has 8 divisors (see below), whose sum is σ = 39503052. Its totient is φ = 8778448.

The previous prime is 21946123. The next prime is 21946139. The reversal of 21946130 is 3164912.

It can be written as a sum of positive squares in 2 ways, for example, as 21613201 + 332929 = 4649^2 + 577^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21946130.

It is not an unprimeable number, because it can be changed into a prime (21946139) 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, 1097297 + ... + 1097316.

Almost surely, 2^21946130 is an apocalyptic number.

21946130 is a deficient number, since it is larger than the sum of its proper divisors (17556922).

21946130 is a wasteful number, since it uses less digits than its factorization.

21946130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194620.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21946130 is about 4684.6696788568. The cubic root of 21946130 is about 279.9750402921.

The spelling of 21946130 in words is "twenty-one million, nine hundred forty-six thousand, one hundred thirty".