22065611656021 has 4 divisors (see below), whose sum is σ = 23024986075872. Its totient is φ = 21106237236172.

The previous prime is 22065611656013. The next prime is 22065611656051. The reversal of 22065611656021 is 12065611656022.

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 22065611656021 - 2³ = 22065611656013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22065611656051) 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, 479687209891 + ... + 479687209936.

It is an arithmetic number, because the mean of its divisors is an integer number (5756246518968).

Almost surely, 2^{22065611656021} is an apocalyptic number.

It is an amenable number.

22065611656021 is a deficient number, since it is larger than the sum of its proper divisors (959374419851).

22065611656021 is an equidigital number, since it uses as much as digits as its factorization.

22065611656021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959374419850.

The product of its (nonzero) digits is 259200, while the sum is 43.

Subtracting from 22065611656021 its reverse (12065611656022), we obtain a palindrome (9999999999999).

The spelling of 22065611656021 in words is "twenty-two trillion, sixty-five billion, six hundred eleven million, six hundred fifty-six thousand, twenty-one".