21020011199 has 16 divisors (see below), whose sum is σ = 24296384160. Its totient is φ = 17972751360.

The previous prime is 21020011141. The next prime is 21020011219. The reversal of 21020011199 is 99111002012.

It is a cyclic number.

It is not a de Polignac number, because 21020011199 - 2¹² = 21020007103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020011109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241547 + ... + 316835.

It is an arithmetic number, because the mean of its divisors is an integer number (1518524010).

Almost surely, 2^21020011199 is an apocalyptic number.

21020011199 is a deficient number, since it is larger than the sum of its proper divisors (3276372961).

21020011199 is a wasteful number, since it uses less digits than its factorization.

21020011199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76810.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 21020011199 in words is "twenty-one billion, twenty million, eleven thousand, one hundred ninety-nine".