20213131233213 has 16 divisors (see below), whose sum is σ = 29945519163840. Its totient is φ = 13475358020592.

The previous prime is 20213131233193. The next prime is 20213131233247. The reversal of 20213131233213 is 31233213131202.

20213131233213 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 3 + 1 + 312 + 332 + 13 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20213131233213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213131273213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4572070 + ... + 7831352.

It is an arithmetic number, because the mean of its divisors is an integer number (1871594947740).

Almost surely, 2^{20213131233213} is an apocalyptic number.

It is an amenable number.

20213131233213 is a deficient number, since it is larger than the sum of its proper divisors (9732387930627).

20213131233213 is a wasteful number, since it uses less digits than its factorization.

20213131233213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488985 (or 3488979 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 20213131233213 its reverse (31233213131202), we get a palindrome (51446344364415).

The spelling of 20213131233213 in words is "twenty trillion, two hundred thirteen billion, one hundred thirty-one million, two hundred thirty-three thousand, two hundred thirteen".