2131213413221 has 2 divisors, whose sum is σ = 2131213413222. Its totient is φ = 2131213413220.

The previous prime is 2131213413151. The next prime is 2131213413299. The reversal of 2131213413221 is 1223143121312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1828728813025 + 302484600196 = 1352305^2 + 549986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131213413221 - 2¹⁸ = 2131213151077 is a prime.

It is a super-2 number, since 2×2131213413221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131213419221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065606706610 + 1065606706611.

It is an arithmetic number, because the mean of its divisors is an integer number (1065606706611).

Almost surely, 2^{2131213413221} is an apocalyptic number.

It is an amenable number.

2131213413221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131213413221 is an equidigital number, since it uses as much as digits as its factorization.

2131213413221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

Adding to 2131213413221 its reverse (1223143121312), we get a palindrome (3354356534533).

The spelling of 2131213413221 in words is "two trillion, one hundred thirty-one billion, two hundred thirteen million, four hundred thirteen thousand, two hundred twenty-one".