21123000110031 has 16 divisors (see below), whose sum is σ = 29135468415360. Its totient is φ = 13596275800800.

The previous prime is 21123000110021. The next prime is 21123000110039. The reversal of 21123000110031 is 13001100032112.

It is a happy number.

It is not a de Polignac number, because 21123000110031 - 2¹³ = 21123000101839 is a prime.

It is a super-2 number, since 2×21123000110031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123000110039) 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, 7759056 + ... + 10121706.

It is an arithmetic number, because the mean of its divisors is an integer number (1820966775960).

Almost surely, 2^{21123000110031} is an apocalyptic number.

21123000110031 is a deficient number, since it is larger than the sum of its proper divisors (8012468305329).

21123000110031 is a wasteful number, since it uses less digits than its factorization.

21123000110031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465446.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21123000110031 its reverse (13001100032112), we get a palindrome (34124100142143).

The spelling of 21123000110031 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred ten thousand, thirty-one".