21910801 has 6 divisors (see below), whose sum is σ = 24083906. Its totient is φ = 19918800.

The previous prime is 21910799. The next prime is 21910829. The reversal of 21910801 is 10801912.

It can be written as a sum of positive squares in only one way, i.e., 12082576 + 9828225 = 3476^2 + 3135^2 .

It is not a de Polignac number, because 21910801 - 2¹ = 21910799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21910871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90420 + ... + 90661.

Almost surely, 2^21910801 is an apocalyptic number.

It is an amenable number.

21910801 is a deficient number, since it is larger than the sum of its proper divisors (2173105).

21910801 is a wasteful number, since it uses less digits than its factorization.

21910801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181103 (or 181092 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 21910801 is about 4680.8974566850. The cubic root of 21910801 is about 279.8247244869.

Subtracting from 21910801 its reverse (10801912), we obtain a square (11108889 = 3333²).

The spelling of 21910801 in words is "twenty-one million, nine hundred ten thousand, eight hundred one".