122161000111721 has 4 divisors (see below), whose sum is σ = 124760170326912. Its totient is φ = 119561829896532.

The previous prime is 122161000111693. The next prime is 122161000111769. The reversal of 122161000111721 is 127111000161221.

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 a de Polignac number, because none of the positive numbers 2^k-122161000111721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122161000111021) 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, 1299585107525 + ... + 1299585107618.

It is an arithmetic number, because the mean of its divisors is an integer number (31190042581728).

Almost surely, 2^{122161000111721} is an apocalyptic number.

It is an amenable number.

122161000111721 is a deficient number, since it is larger than the sum of its proper divisors (2599170215191).

122161000111721 is an equidigital number, since it uses as much as digits as its factorization.

122161000111721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599170215190.

The product of its (nonzero) digits is 336, while the sum is 26.

Adding to 122161000111721 its reverse (127111000161221), we get a palindrome (249272000272942).

The spelling of 122161000111721 in words is "one hundred twenty-two trillion, one hundred sixty-one billion, one hundred eleven thousand, seven hundred twenty-one".