21274241 has 4 divisors (see below), whose sum is σ = 22199232. Its totient is φ = 20349252.

The previous prime is 21274237. The next prime is 21274247. The reversal of 21274241 is 14247212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21274241 - 2² = 21274237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 924967 = 21274241 / (2 + 1 + 2 + 7 + 4 + 2 + 4 + 1).

It is not an unprimeable number, because it can be changed into a prime (21274247) 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, 462461 + ... + 462506.

It is an arithmetic number, because the mean of its divisors is an integer number (5549808).

Almost surely, 2^21274241 is an apocalyptic number.

It is an amenable number.

21274241 is a deficient number, since it is larger than the sum of its proper divisors (924991).

21274241 is an equidigital number, since it uses as much as digits as its factorization.

21274241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924990.

The product of its digits is 896, while the sum is 23.

The square root of 21274241 is about 4612.4007848408. The cubic root of 21274241 is about 277.0881958381.

The spelling of 21274241 in words is "twenty-one million, two hundred seventy-four thousand, two hundred forty-one".