213123402031 has 4 divisors (see below), whose sum is σ = 213381109512. Its totient is φ = 212865694552.

The previous prime is 213123402017. The next prime is 213123402067. The reversal of 213123402031 is 130204321312.

213123402031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 213123402031 - 2⁵ = 213123401999 is a prime.

It is a super-2 number, since 2×213123402031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213123401993 and 213123402011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123402431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128852500 + ... + 128854153.

It is an arithmetic number, because the mean of its divisors is an integer number (53345277378).

Almost surely, 2^213123402031 is an apocalyptic number.

213123402031 is a deficient number, since it is larger than the sum of its proper divisors (257707481).

213123402031 is an equidigital number, since it uses as much as digits as its factorization.

213123402031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257707480.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 213123402031 its reverse (130204321312), we get a palindrome (343327723343).

The spelling of 213123402031 in words is "two hundred thirteen billion, one hundred twenty-three million, four hundred two thousand, thirty-one".