31211320201 has 2 divisors, whose sum is σ = 31211320202. Its totient is φ = 31211320200.

The previous prime is 31211320099. The next prime is 31211320241. The reversal of 31211320201 is 10202311213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30166479225 + 1044840976 = 173685^2 + 32324^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211320201 - 2⁷ = 31211320073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31211320241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605660100 + 15605660101.

It is an arithmetic number, because the mean of its divisors is an integer number (15605660101).

Almost surely, 2^31211320201 is an apocalyptic number.

It is an amenable number.

31211320201 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211320201 is an equidigital number, since it uses as much as digits as its factorization.

31211320201 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 31211320201 its reverse (10202311213), we get a palindrome (41413631414).

The spelling of 31211320201 in words is "thirty-one billion, two hundred eleven million, three hundred twenty thousand, two hundred one".