31221321100223 has 2 divisors, whose sum is σ = 31221321100224. Its totient is φ = 31221321100222.

The previous prime is 31221321100139. The next prime is 31221321100237. The reversal of 31221321100223 is 32200112312213.

It is a strong prime.

It is an emirp because it is prime and its reverse (32200112312213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31221321100223 - 2⁸ = 31221321099967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31221321100273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610660550111 + 15610660550112.

It is an arithmetic number, because the mean of its divisors is an integer number (15610660550112).

Almost surely, 2^{31221321100223} is an apocalyptic number.

31221321100223 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221321100223 is an equidigital number, since it uses as much as digits as its factorization.

31221321100223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31221321100223 its reverse (32200112312213), we get a palindrome (63421433412436).

The spelling of 31221321100223 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred thousand, two hundred twenty-three".