22216123246561 has 4 divisors (see below), whose sum is σ = 22216157428500. Its totient is φ = 22216089064624.

The previous prime is 22216123246547. The next prime is 22216123246579. The reversal of 22216123246561 is 16564232161222.

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 13270975414225 + 8945147832336 = 3642935^2 + 2990844^2 .

It is a cyclic number.

It is not a de Polignac number, because 22216123246561 - 2⁷ = 22216123246433 is a prime.

It is a super-2 number, since 2×22216123246561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22216123246661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16096786 + ... + 17422363.

It is an arithmetic number, because the mean of its divisors is an integer number (5554039357125).

Almost surely, 2^{22216123246561} is an apocalyptic number.

It is an amenable number.

22216123246561 is a deficient number, since it is larger than the sum of its proper divisors (34181939).

22216123246561 is an equidigital number, since it uses as much as digits as its factorization.

22216123246561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34181938.

The product of its digits is 414720, while the sum is 43.

The spelling of 22216123246561 in words is "twenty-two trillion, two hundred sixteen billion, one hundred twenty-three million, two hundred forty-six thousand, five hundred sixty-one".