20213142342391 has 2 divisors, whose sum is σ = 20213142342392. Its totient is φ = 20213142342390.

The previous prime is 20213142342317. The next prime is 20213142342443. The reversal of 20213142342391 is 19324324131202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20213142342391 - 2¹³ = 20213142334199 is a prime.

It is a super-2 number, since 2×20213142342391² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20213142342391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213142343391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106571171195 + 10106571171196.

It is an arithmetic number, because the mean of its divisors is an integer number (10106571171196).

Almost surely, 2^{20213142342391} is an apocalyptic number.

20213142342391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213142342391 is an equidigital number, since it uses as much as digits as its factorization.

20213142342391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 20213142342391 its reverse (19324324131202), we get a palindrome (39537466473593).

The spelling of 20213142342391 in words is "twenty trillion, two hundred thirteen billion, one hundred forty-two million, three hundred forty-two thousand, three hundred ninety-one".