20002121999 has 2 divisors, whose sum is σ = 20002122000. Its totient is φ = 20002121998.

The previous prime is 20002121981. The next prime is 20002122053. The reversal of 20002121999 is 99912120002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20002121999 - 2⁸ = 20002121743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002121929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001060999 + 10001061000.

It is an arithmetic number, because the mean of its divisors is an integer number (10001061000).

Almost surely, 2^20002121999 is an apocalyptic number.

20002121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002121999 is an equidigital number, since it uses as much as digits as its factorization.

20002121999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 20002121999 in words is "twenty billion, two million, one hundred twenty-one thousand, nine hundred ninety-nine".