20311102213 has 2 divisors, whose sum is σ = 20311102214. Its totient is φ = 20311102212.

The previous prime is 20311102199. The next prime is 20311102243. The reversal of 20311102213 is 31220111302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18209613249 + 2101488964 = 134943^2 + 45842^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311102213 - 2²¹ = 20309005061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311102243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155551106 + 10155551107.

It is an arithmetic number, because the mean of its divisors is an integer number (10155551107).

Almost surely, 2^20311102213 is an apocalyptic number.

It is an amenable number.

20311102213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311102213 is an equidigital number, since it uses as much as digits as its factorization.

20311102213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20311102213 its reverse (31220111302), we get a palindrome (51531213515).

The spelling of 20311102213 in words is "twenty billion, three hundred eleven million, one hundred two thousand, two hundred thirteen".