21322451441 has 4 divisors (see below), whose sum is σ = 21333120000. Its totient is φ = 21311782884.

The previous prime is 21322451401. The next prime is 21322451459. The reversal of 21322451441 is 14415422312.

It is a happy number.

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 21322451441 - 2¹⁰ = 21322450417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21322451401) 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, 5331281 + ... + 5335278.

It is an arithmetic number, because the mean of its divisors is an integer number (5333280000).

Almost surely, 2^21322451441 is an apocalyptic number.

It is an amenable number.

21322451441 is a deficient number, since it is larger than the sum of its proper divisors (10668559).

21322451441 is a wasteful number, since it uses less digits than its factorization.

21322451441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668558.

The product of its digits is 7680, while the sum is 29.

Adding to 21322451441 its reverse (14415422312), we get a palindrome (35737873753).

The spelling of 21322451441 in words is "twenty-one billion, three hundred twenty-two million, four hundred fifty-one thousand, four hundred forty-one".