21313121222131 has 32 divisors (see below), whose sum is σ = 21905719472000. Its totient is φ = 20729820672000.

The previous prime is 21313121222117. The next prime is 21313121222149. The reversal of 21313121222131 is 13122212131312.

It is a cyclic number.

It is not a de Polignac number, because 21313121222131 - 2¹³ = 21313121213939 is a prime.

It is a super-2 number, since 2×21313121222131² (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 = 21313121222096 and 21313121222105.

It is not an unprimeable number, because it can be changed into a prime (21313121222111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6725502115 + ... + 6725505283.

It is an arithmetic number, because the mean of its divisors is an integer number (684553733500).

Almost surely, 2^{21313121222131} is an apocalyptic number.

21313121222131 is a deficient number, since it is larger than the sum of its proper divisors (592598249869).

21313121222131 is a wasteful number, since it uses less digits than its factorization.

21313121222131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671.

The product of its digits is 864, while the sum is 25.

Adding to 21313121222131 its reverse (13122212131312), we get a palindrome (34435333353443).

The spelling of 21313121222131 in words is "twenty-one trillion, three hundred thirteen billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred thirty-one".