21201121199 has 2 divisors, whose sum is σ = 21201121200. Its totient is φ = 21201121198.

The previous prime is 21201121189. The next prime is 21201121219. The reversal of 21201121199 is 99112110212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201121199 - 2¹² = 21201117103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201121129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600560599 + 10600560600.

It is an arithmetic number, because the mean of its divisors is an integer number (10600560600).

Almost surely, 2^21201121199 is an apocalyptic number.

21201121199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201121199 is an equidigital number, since it uses as much as digits as its factorization.

21201121199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 21201121199 in words is "twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred ninety-nine".