21331221321131 has 2 divisors, whose sum is σ = 21331221321132. Its totient is φ = 21331221321130.

The previous prime is 21331221321101. The next prime is 21331221321161. The reversal of 21331221321131 is 13112312213312.

It is a balanced prime because it is at equal distance from previous prime (21331221321101) and next prime (21331221321161).

It is a cyclic number.

It is not a de Polignac number, because 21331221321131 - 2³⁸ = 21056343414187 is a prime.

It is a super-2 number, since 2×21331221321131² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21331221321131.

It is not a weakly prime, because it can be changed into another prime (21331221321101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665610660565 + 10665610660566.

It is an arithmetic number, because the mean of its divisors is an integer number (10665610660566).

Almost surely, 2^{21331221321131} is an apocalyptic number.

21331221321131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331221321131 is an equidigital number, since it uses as much as digits as its factorization.

21331221321131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

Adding to 21331221321131 its reverse (13112312213312), we get a palindrome (34443533534443).

The spelling of 21331221321131 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred twenty-one million, three hundred twenty-one thousand, one hundred thirty-one".