2131100441561 has 16 divisors (see below), whose sum is σ = 2637545904000. Its totient is φ = 1676725584768.

The previous prime is 2131100441531. The next prime is 2131100441563. The reversal of 2131100441561 is 1651440011312.

It is not a de Polignac number, because 2131100441561 - 2¹⁰ = 2131100440537 is a prime.

It is a super-2 number, since 2×2131100441561² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2131100441563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65399036 + ... + 65431613.

It is an arithmetic number, because the mean of its divisors is an integer number (164846619000).

Almost surely, 2^{2131100441561} is an apocalyptic number.

It is an amenable number.

2131100441561 is a deficient number, since it is larger than the sum of its proper divisors (506445462439).

2131100441561 is a wasteful number, since it uses less digits than its factorization.

2131100441561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130830848.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 2131100441561 its reverse (1651440011312), we get a palindrome (3782540452873).

The spelling of 2131100441561 in words is "two trillion, one hundred thirty-one billion, one hundred million, four hundred forty-one thousand, five hundred sixty-one".