2153971688101 has 4 divisors (see below), whose sum is σ = 2153996160012. Its totient is φ = 2153947216192.

The previous prime is 2153971688041. The next prime is 2153971688117. The reversal of 2153971688101 is 1018861793512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1560185857476 + 593785830625 = 1249074^2 + 770575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2153971688101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2153971682101) 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, 12103450 + ... + 12280123.

It is an arithmetic number, because the mean of its divisors is an integer number (538499040003).

Almost surely, 2^{2153971688101} is an apocalyptic number.

It is an amenable number.

2153971688101 is a deficient number, since it is larger than the sum of its proper divisors (24471911).

2153971688101 is an equidigital number, since it uses as much as digits as its factorization.

2153971688101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24471910.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 2153971688101 in words is "two trillion, one hundred fifty-three billion, nine hundred seventy-one million, six hundred eighty-eight thousand, one hundred one".