2172720351231 has 6 divisors (see below), whose sum is σ = 3138373840680. Its totient is φ = 1448480234148.

The previous prime is 2172720351229. The next prime is 2172720351233. The reversal of 2172720351231 is 1321530272712.

2172720351231 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 72 + 0 + 351 + 231 = 666.

It is an interprime number because it is at equal distance from previous prime (2172720351229) and next prime (2172720351233).

It is not a de Polignac number, because 2172720351231 - 2¹ = 2172720351229 is a prime.

It is a super-2 number, since 2×2172720351231² (a number of 25 digits) contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172720351233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120706686171 + ... + 120706686188.

It is an arithmetic number, because the mean of its divisors is an integer number (523062306780).

Almost surely, 2^{2172720351231} is an apocalyptic number.

2172720351231 is a deficient number, since it is larger than the sum of its proper divisors (965653489449).

2172720351231 is a wasteful number, since it uses less digits than its factorization.

2172720351231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241413372365 (or 241413372362 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 2172720351231 in words is "two trillion, one hundred seventy-two billion, seven hundred twenty million, three hundred fifty-one thousand, two hundred thirty-one".