21110311131323 has 4 divisors (see below), whose sum is σ = 21124099709688. Its totient is φ = 21096522552960.

The previous prime is 21110311131317. The next prime is 21110311131367. The reversal of 21110311131323 is 32313111301112.

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 21110311131323 - 2²² = 21110306937019 is a prime.

It is a super-2 number, since 2×21110311131323² (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 (21110311151323) 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, 6894286886 + ... + 6894289947.

It is an arithmetic number, because the mean of its divisors is an integer number (5281024927422).

Almost surely, 2^{21110311131323} is an apocalyptic number.

21110311131323 is a deficient number, since it is larger than the sum of its proper divisors (13788578365).

21110311131323 is a wasteful number, since it uses less digits than its factorization.

21110311131323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13788578364.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 21110311131323 its reverse (32313111301112), we get a palindrome (53423422432435).

The spelling of 21110311131323 in words is "twenty-one trillion, one hundred ten billion, three hundred eleven million, one hundred thirty-one thousand, three hundred twenty-three".