2157511156100 has 18 divisors (see below), whose sum is σ = 4681799208954. Its totient is φ = 863004462400.

The previous prime is 2157511155983. The next prime is 2157511156187. The reversal of 2157511156100 is 16511157512.

It can be written as a sum of positive squares in 3 ways, for example, as 386008719616 + 1771502436484 = 621296^2 + 1330978^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10787555681 + ... + 10787555880.

It is an arithmetic number, because the mean of its divisors is an integer number (260099956053).

Almost surely, 2^{2157511156100} is an apocalyptic number.

2157511156100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157511156100 is an abundant number, since it is smaller than the sum of its proper divisors (2524288052854).

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

2157511156100 is a wasteful number, since it uses less digits than its factorization.

2157511156100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21575111575 (or 21575111568 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 35.

The spelling of 2157511156100 in words is "two trillion, one hundred fifty-seven billion, five hundred eleven million, one hundred fifty-six thousand, one hundred".