20123131001213 has 4 divisors (see below), whose sum is σ = 20123618793180. Its totient is φ = 20122643209248.

The previous prime is 20123131001201. The next prime is 20123131001231. The reversal of 20123131001213 is 31210013132102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4991949027289 + 15131181973924 = 2234267^2 + 3889882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123131001213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123131001293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243834098 + ... + 243916611.

It is an arithmetic number, because the mean of its divisors is an integer number (5030904698295).

Almost surely, 2^{20123131001213} is an apocalyptic number.

It is an amenable number.

20123131001213 is a deficient number, since it is larger than the sum of its proper divisors (487791967).

20123131001213 is an equidigital number, since it uses as much as digits as its factorization.

20123131001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487791966.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20123131001213 its reverse (31210013132102), we get a palindrome (51333144133315).

The spelling of 20123131001213 in words is "twenty trillion, one hundred twenty-three billion, one hundred thirty-one million, one thousand, two hundred thirteen".