21948453 has 6 divisors (see below), whose sum is σ = 31703334. Its totient is φ = 14632296.

The previous prime is 21948427. The next prime is 21948457. The reversal of 21948453 is 35484912.

It can be written as a sum of positive squares in only one way, i.e., 13198689 + 8749764 = 3633^2 + 2958^2 .

It is not a de Polignac number, because 21948453 - 2¹² = 21944357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21948457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1219350 + ... + 1219367.

It is an arithmetic number, because the mean of its divisors is an integer number (5283889).

Almost surely, 2^21948453 is an apocalyptic number.

It is an amenable number.

21948453 is a deficient number, since it is larger than the sum of its proper divisors (9754881).

21948453 is a wasteful number, since it uses less digits than its factorization.

21948453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438723 (or 2438720 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21948453 is about 4684.9176086672. The cubic root of 21948453 is about 279.9849184054.

The spelling of 21948453 in words is "twenty-one million, nine hundred forty-eight thousand, four hundred fifty-three".