161042221212 has 24 divisors (see below), whose sum is σ = 397869017616. Its totient is φ = 50523049728.

The previous prime is 161042221211. The next prime is 161042221213. The reversal of 161042221212 is 212122240161.

It is an interprime number because it is at equal distance from previous prime (161042221211) and next prime (161042221213).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161042221211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394711123 + ... + 394711530.

It is an arithmetic number, because the mean of its divisors is an integer number (16577875734).

Almost surely, 2^161042221212 is an apocalyptic number.

161042221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161042221212 is an abundant number, since it is smaller than the sum of its proper divisors (236826796404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161042221212 is a wasteful number, since it uses less digits than its factorization.

161042221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789422677 (or 789422675 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 161042221212 its reverse (212122240161), we get a palindrome (373164461373).

The spelling of 161042221212 in words is "one hundred sixty-one billion, forty-two million, two hundred twenty-one thousand, two hundred twelve".