21102123303131 has 8 divisors (see below), whose sum is σ = 22725476544624. Its totient is φ = 19478786202720.

The previous prime is 21102123303119. The next prime is 21102123303133. The reversal of 21102123303131 is 13130332120112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21102123303131 - 2³⁰ = 21101049561307 is a prime.

It is a super-2 number, since 2×21102123303131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102123303097 and 21102123303106.

It is not an unprimeable number, because it can be changed into a prime (21102123303133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248716 + ... + 6615401.

It is an arithmetic number, because the mean of its divisors is an integer number (2840684568078).

Almost surely, 2^{21102123303131} is an apocalyptic number.

21102123303131 is a deficient number, since it is larger than the sum of its proper divisors (1623353241493).

21102123303131 is a wasteful number, since it uses less digits than its factorization.

21102123303131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8070541.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21102123303131 its reverse (13130332120112), we get a palindrome (34232455423243).

The spelling of 21102123303131 in words is "twenty-one trillion, one hundred two billion, one hundred twenty-three million, three hundred three thousand, one hundred thirty-one".