21920301 has 36 divisors (see below), whose sum is σ = 35545692. Its totient is φ = 13436928.

The previous prime is 21920299. The next prime is 21920321. The reversal of 21920301 is 10302912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13883076 + 8037225 = 3726^2 + 2835^2 .

It is not a de Polignac number, because 21920301 - 2¹ = 21920299 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21920321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 85165 + ... + 85421.

Almost surely, 2^21920301 is an apocalyptic number.

It is an amenable number.

21920301 is a deficient number, since it is larger than the sum of its proper divisors (13625391).

21920301 is an frugal number, since it uses more digits than its factorization.

21920301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21920301 is about 4681.9121093844. The cubic root of 21920301 is about 279.8651604159.

The spelling of 21920301 in words is "twenty-one million, nine hundred twenty thousand, three hundred one".