21020001199 has 2 divisors, whose sum is σ = 21020001200. Its totient is φ = 21020001198.

The previous prime is 21020001137. The next prime is 21020001209. The reversal of 21020001199 is 99110002012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020001199 - 2⁷ = 21020001071 is a prime.

It is a super-2 number, since 2×21020001199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020007199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510000599 + 10510000600.

It is an arithmetic number, because the mean of its divisors is an integer number (10510000600).

Almost surely, 2^21020001199 is an apocalyptic number.

21020001199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020001199 is an equidigital number, since it uses as much as digits as its factorization.

21020001199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 21020001199 in words is "twenty-one billion, twenty million, one thousand, one hundred ninety-nine".