20210131213 has 2 divisors, whose sum is σ = 20210131214. Its totient is φ = 20210131212.

The previous prime is 20210131181. The next prime is 20210131229. The reversal of 20210131213 is 31213101202.

It is an a-pointer prime, because the next prime (20210131229) can be obtained adding 20210131213 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16200962089 + 4009169124 = 127283^2 + 63318^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210131213 - 2⁵ = 20210131181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210131013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105065606 + 10105065607.

It is an arithmetic number, because the mean of its divisors is an integer number (10105065607).

Almost surely, 2^20210131213 is an apocalyptic number.

It is an amenable number.

20210131213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210131213 is an equidigital number, since it uses as much as digits as its factorization.

20210131213 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20210131213 its reverse (31213101202), we get a palindrome (51423232415).

The spelling of 20210131213 in words is "twenty billion, two hundred ten million, one hundred thirty-one thousand, two hundred thirteen".