21674253 has 4 divisors (see below), whose sum is σ = 28899008. Its totient is φ = 14449500.

The previous prime is 21674249. The next prime is 21674287. The reversal of 21674253 is 35247612.

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 not a de Polignac number, because 21674253 - 2² = 21674249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21674253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674153) 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, 3612373 + ... + 3612378.

It is an arithmetic number, because the mean of its divisors is an integer number (7224752).

Almost surely, 2^21674253 is an apocalyptic number.

It is an amenable number.

21674253 is a deficient number, since it is larger than the sum of its proper divisors (7224755).

21674253 is an equidigital number, since it uses as much as digits as its factorization.

21674253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7224754.

The product of its digits is 10080, while the sum is 30.

The square root of 21674253 is about 4655.5615128575. The cubic root of 21674253 is about 278.8140871636.

The spelling of 21674253 in words is "twenty-one million, six hundred seventy-four thousand, two hundred fifty-three".