21641007222743 has 4 divisors (see below), whose sum is σ = 21641051104848. Its totient is φ = 21640963340640.

The previous prime is 21641007222721. The next prime is 21641007222761. The reversal of 21641007222743 is 34722270014612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21641007222743 - 2²⁰ = 21641006174167 is a prime.

It is a super-2 number, since 2×21641007222743² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21641007222743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641007222713) 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, 21192803 + ... + 22190468.

It is an arithmetic number, because the mean of its divisors is an integer number (5410262776212).

Almost surely, 2^{21641007222743} is an apocalyptic number.

21641007222743 is a deficient number, since it is larger than the sum of its proper divisors (43882105).

21641007222743 is an equidigital number, since it uses as much as digits as its factorization.

21641007222743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43882104.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 21641007222743 in words is "twenty-one trillion, six hundred forty-one billion, seven million, two hundred twenty-two thousand, seven hundred forty-three".