20212020391 has 2 divisors, whose sum is σ = 20212020392. Its totient is φ = 20212020390.

The previous prime is 20212020379. The next prime is 20212020407. The reversal of 20212020391 is 19302021202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20212020391 - 2¹³ = 20212012199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212020091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106010195 + 10106010196.

It is an arithmetic number, because the mean of its divisors is an integer number (10106010196).

Almost surely, 2^20212020391 is an apocalyptic number.

20212020391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212020391 is an equidigital number, since it uses as much as digits as its factorization.

20212020391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 20212020391 its reverse (19302021202), we get a palindrome (39514041593).

The spelling of 20212020391 in words is "twenty billion, two hundred twelve million, twenty thousand, three hundred ninety-one".