21211322197213 has 2 divisors, whose sum is σ = 21211322197214. Its totient is φ = 21211322197212.

The previous prime is 21211322197187. The next prime is 21211322197283. The reversal of 21211322197213 is 31279122311212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18123436808569 + 3087885388644 = 4257163^2 + 1757238^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211322197213 - 2¹³ = 21211322189021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211322197283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605661098606 + 10605661098607.

It is an arithmetic number, because the mean of its divisors is an integer number (10605661098607).

Almost surely, 2^{21211322197213} is an apocalyptic number.

It is an amenable number.

21211322197213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211322197213 is an equidigital number, since it uses as much as digits as its factorization.

21211322197213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The spelling of 21211322197213 in words is "twenty-one trillion, two hundred eleven billion, three hundred twenty-two million, one hundred ninety-seven thousand, two hundred thirteen".