21454461121 has 4 divisors (see below), whose sum is σ = 22146540544. Its totient is φ = 20762381700.

The previous prime is 21454460981. The next prime is 21454461163. The reversal of 21454461121 is 12116445412.

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 21454461121 - 2²⁹ = 20917590209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 692079391 = 21454461121 / (2 + 1 + 4 + 5 + 4 + 4 + 6 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454441121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346039665 + ... + 346039726.

It is an arithmetic number, because the mean of its divisors is an integer number (5536635136).

Almost surely, 2^21454461121 is an apocalyptic number.

It is an amenable number.

21454461121 is a deficient number, since it is larger than the sum of its proper divisors (692079423).

21454461121 is an equidigital number, since it uses as much as digits as its factorization.

21454461121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692079422.

The product of its digits is 7680, while the sum is 31.

The spelling of 21454461121 in words is "twenty-one billion, four hundred fifty-four million, four hundred sixty-one thousand, one hundred twenty-one".