21622066707161 has 4 divisors (see below), whose sum is σ = 21622089363252. Its totient is φ = 21622044051072.

The previous prime is 21622066707107. The next prime is 21622066707179. The reversal of 21622066707161 is 16170766022612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13995941443225 + 7626125263936 = 3741115^2 + 2761544^2 .

It is a cyclic number.

It is not a de Polignac number, because 21622066707161 - 2¹⁸ = 21622066445017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21622066703161) 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, 9830516 + ... + 11827221.

It is an arithmetic number, because the mean of its divisors is an integer number (5405522340813).

Almost surely, 2^{21622066707161} is an apocalyptic number.

It is an amenable number.

21622066707161 is a deficient number, since it is larger than the sum of its proper divisors (22656091).

21622066707161 is an equidigital number, since it uses as much as digits as its factorization.

21622066707161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22656090.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 21622066707161 in words is "twenty-one trillion, six hundred twenty-two billion, sixty-six million, seven hundred seven thousand, one hundred sixty-one".