2101131172156 has 12 divisors (see below), whose sum is σ = 3678464017368. Its totient is φ = 1050141452912.

The previous prime is 2101131172141. The next prime is 2101131172157. The reversal of 2101131172156 is 6512711311012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101131172157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106022146 + ... + 106041961.

It is an arithmetic number, because the mean of its divisors is an integer number (306538668114).

Almost surely, 2^{2101131172156} is an apocalyptic number.

It is an amenable number.

2101131172156 is a deficient number, since it is larger than the sum of its proper divisors (1577332845212).

2101131172156 is a wasteful number, since it uses less digits than its factorization.

2101131172156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212066588 (or 212066586 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 31.

Adding to 2101131172156 its reverse (6512711311012), we get a palindrome (8613842483168).

The spelling of 2101131172156 in words is "two trillion, one hundred one billion, one hundred thirty-one million, one hundred seventy-two thousand, one hundred fifty-six".