20211423091 has 2 divisors, whose sum is σ = 20211423092. Its totient is φ = 20211423090.

The previous prime is 20211423083. The next prime is 20211423107. The reversal of 20211423091 is 19032411202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211423091 - 2³ = 20211423083 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211423041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105711545 + 10105711546.

It is an arithmetic number, because the mean of its divisors is an integer number (10105711546).

Almost surely, 2^20211423091 is an apocalyptic number.

20211423091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211423091 is an equidigital number, since it uses as much as digits as its factorization.

20211423091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 20211423091 its reverse (19032411202), we get a palindrome (39243834293).

The spelling of 20211423091 in words is "twenty billion, two hundred eleven million, four hundred twenty-three thousand, ninety-one".