21274044361 has 4 divisors (see below), whose sum is σ = 21414932224. Its totient is φ = 21133156500.

The previous prime is 21274044313. The next prime is 21274044367. The reversal of 21274044361 is 16344047212.

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 a de Polignac number, because none of the positive numbers 2^k-21274044361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21274044367) 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, 70443705 + ... + 70444006.

It is an arithmetic number, because the mean of its divisors is an integer number (5353733056).

Almost surely, 2^21274044361 is an apocalyptic number.

It is an amenable number.

21274044361 is a deficient number, since it is larger than the sum of its proper divisors (140887863).

21274044361 is a wasteful number, since it uses less digits than its factorization.

21274044361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140887862.

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 21274044361 in words is "twenty-one billion, two hundred seventy-four million, forty-four thousand, three hundred sixty-one".