21111001100131 has 4 divisors (see below), whose sum is σ = 21560171336352. Its totient is φ = 20661830863912.

The previous prime is 21111001100129. The next prime is 21111001100179. The reversal of 21111001100131 is 13100110011112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111001100131 - 2¹ = 21111001100129 is a prime.

It is a super-2 number, since 2×21111001100131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111001110131) 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, 224585118040 + ... + 224585118133.

It is an arithmetic number, because the mean of its divisors is an integer number (5390042834088).

Almost surely, 2^{21111001100131} is an apocalyptic number.

21111001100131 is a deficient number, since it is larger than the sum of its proper divisors (449170236221).

21111001100131 is an equidigital number, since it uses as much as digits as its factorization.

21111001100131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449170236220.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 21111001100131 its reverse (13100110011112), we get a palindrome (34211111111243).

The spelling of 21111001100131 in words is "twenty-one trillion, one hundred eleven billion, one million, one hundred thousand, one hundred thirty-one".