2122221212172 has 48 divisors (see below), whose sum is σ = 5521496964480. Its totient is φ = 704907388944.

The previous prime is 2122221212159. The next prime is 2122221212191. The reversal of 2122221212172 is 2712121222212.

2122221212172 is a `hidden beast` number, since 212 + 2 + 221 + 212 + 17 + 2 = 666.

It is a super-3 number, since 3×2122221212172³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34687098 + ... + 34748225.

It is an arithmetic number, because the mean of its divisors is an integer number (115031186760).

Almost surely, 2^{2122221212172} is an apocalyptic number.

It is an amenable number.

2122221212172 is an abundant number, since it is smaller than the sum of its proper divisors (3399275752308).

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

2122221212172 is a wasteful number, since it uses less digits than its factorization.

2122221212172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69435619 (or 69435611 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

Adding to 2122221212172 its reverse (2712121222212), we get a palindrome (4834342434384).

The spelling of 2122221212172 in words is "two trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, one hundred seventy-two".