20102211122172 has 24 divisors (see below), whose sum is σ = 48522578571600. Its totient is φ = 6469677142656.

The previous prime is 20102211122171. The next prime is 20102211122233. The reversal of 20102211122172 is 27122111220102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102211122171) 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, 28882486897 + ... + 28882487592.

It is an arithmetic number, because the mean of its divisors is an integer number (2021774107150).

Almost surely, 2^{20102211122172} is an apocalyptic number.

It is an amenable number.

20102211122172 is an abundant number, since it is smaller than the sum of its proper divisors (28420367449428).

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

20102211122172 is a wasteful number, since it uses less digits than its factorization.

20102211122172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57764974525 (or 57764974523 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

Adding to 20102211122172 its reverse (27122111220102), we get a palindrome (47224322342274).

The spelling of 20102211122172 in words is "twenty trillion, one hundred two billion, two hundred eleven million, one hundred twenty-two thousand, one hundred seventy-two".