2251163021226 has 192 divisors, whose sum is σ = 5456665792512. Its totient is φ = 616911216768.

The previous prime is 2251163021183. The next prime is 2251163021251. The reversal of 2251163021226 is 6221203611522.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 182377611 + ... + 182389953.

It is an arithmetic number, because the mean of its divisors is an integer number (28420134336).

Almost surely, 2^{2251163021226} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2251163021226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2728332896256).

2251163021226 is an abundant number, since it is smaller than the sum of its proper divisors (3205502771286).

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

2251163021226 is a wasteful number, since it uses less digits than its factorization.

2251163021226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12673 (or 12666 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 2251163021226 its reverse (6221203611522), we get a palindrome (8472366632748).

The spelling of 2251163021226 in words is "two trillion, two hundred fifty-one billion, one hundred sixty-three million, twenty-one thousand, two hundred twenty-six".