21048901 has 2 divisors, whose sum is σ = 21048902. Its totient is φ = 21048900.

The previous prime is 21048889. The next prime is 21048913. The reversal of 21048901 is 10984012.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21048889) and next prime (21048913).

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 391876 = 4545^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 21048901 - 2¹⁷ = 20917829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21048931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10524450 + 10524451.

It is an arithmetic number, because the mean of its divisors is an integer number (10524451).

Almost surely, 2^21048901 is an apocalyptic number.

It is an amenable number.

21048901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21048901 is an equidigital number, since it uses as much as digits as its factorization.

21048901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21048901 is about 4587.9081289843. The cubic root of 21048901 is about 276.1064010749.

The spelling of 21048901 in words is "twenty-one million, forty-eight thousand, nine hundred one".