21622131772221 has 16 divisors (see below), whose sum is σ = 29008665725120. Its totient is φ = 14325190122240.

The previous prime is 21622131772211. The next prime is 21622131772231. The reversal of 21622131772221 is 12227713122612.

It is an interprime number because it is at equal distance from previous prime (21622131772211) and next prime (21622131772231).

It is not a de Polignac number, because 21622131772221 - 2¹⁴ = 21622131755837 is a prime.

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 21622131772221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622131772211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4482615 + ... + 7958523.

It is an arithmetic number, because the mean of its divisors is an integer number (1813041607820).

Almost surely, 2^{21622131772221} is an apocalyptic number.

It is an amenable number.

21622131772221 is a deficient number, since it is larger than the sum of its proper divisors (7386533952899).

21622131772221 is a wasteful number, since it uses less digits than its factorization.

21622131772221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488796.

The product of its digits is 56448, while the sum is 39.

Adding to 21622131772221 its reverse (12227713122612), we get a palindrome (33849844894833).

The spelling of 21622131772221 in words is "twenty-one trillion, six hundred twenty-two billion, one hundred thirty-one million, seven hundred seventy-two thousand, two hundred twenty-one".