20001223091 has 2 divisors, whose sum is σ = 20001223092. Its totient is φ = 20001223090.

The previous prime is 20001223087. The next prime is 20001223103. The reversal of 20001223091 is 19032210002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001223091 - 2² = 20001223087 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001222091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000611545 + 10000611546.

It is an arithmetic number, because the mean of its divisors is an integer number (10000611546).

Almost surely, 2^20001223091 is an apocalyptic number.

20001223091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001223091 is an equidigital number, since it uses as much as digits as its factorization.

20001223091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20001223091 its reverse (19032210002), we get a palindrome (39033433093).

The spelling of 20001223091 in words is "twenty billion, one million, two hundred twenty-three thousand, ninety-one".