2172154431216 has 640 divisors, whose sum is σ = 7339333681152. Its totient is φ = 537338880000.

The previous prime is 2172154431143. The next prime is 2172154431229. The reversal of 2172154431216 is 6121344512712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1206081516 + ... + 1206083316.

Almost surely, 2^{2172154431216} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172154431216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3669666840576).

2172154431216 is an abundant number, since it is smaller than the sum of its proper divisors (5167179249936).

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

2172154431216 is a wasteful number, since it uses less digits than its factorization.

2172154431216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2055 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

Adding to 2172154431216 its reverse (6121344512712), we get a palindrome (8293498943928).

The spelling of 2172154431216 in words is "two trillion, one hundred seventy-two billion, one hundred fifty-four million, four hundred thirty-one thousand, two hundred sixteen".