20010103221391 has 2 divisors, whose sum is σ = 20010103221392. Its totient is φ = 20010103221390.

The previous prime is 20010103221389. The next prime is 20010103221461. The reversal of 20010103221391 is 19312230101002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20010103221391 - 2¹ = 20010103221389 is a prime.

Together with 20010103221389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010103227391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005051610695 + 10005051610696.

It is an arithmetic number, because the mean of its divisors is an integer number (10005051610696).

Almost surely, 2^{20010103221391} is an apocalyptic number.

20010103221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010103221391 is an equidigital number, since it uses as much as digits as its factorization.

20010103221391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

Adding to 20010103221391 its reverse (19312230101002), we get a palindrome (39322333322393).

The spelling of 20010103221391 in words is "twenty trillion, ten billion, one hundred three million, two hundred twenty-one thousand, three hundred ninety-one".