10212121999 has 2 divisors, whose sum is σ = 10212122000. Its totient is φ = 10212121998.

The previous prime is 10212121981. The next prime is 10212122009. The reversal of 10212121999 is 99912121201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 10212121999 - 2¹⁵ = 10212089231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212124999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106060999 + 5106061000.

It is an arithmetic number, because the mean of its divisors is an integer number (5106061000).

Almost surely, 2^10212121999 is an apocalyptic number.

10212121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212121999 is an equidigital number, since it uses as much as digits as its factorization.

10212121999 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 37.

The spelling of 10212121999 in words is "ten billion, two hundred twelve million, one hundred twenty-one thousand, nine hundred ninety-nine".