21000221199 has 24 divisors (see below), whose sum is σ = 31403466432. Its totient is φ = 13514549760.

The previous prime is 21000221189. The next prime is 21000221243. The reversal of 21000221199 is 99112200012.

It is not a de Polignac number, because 21000221199 - 2⁷ = 21000221071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309162 + ... + 370919.

It is an arithmetic number, because the mean of its divisors is an integer number (1308477768).

Almost surely, 2^21000221199 is an apocalyptic number.

21000221199 is a deficient number, since it is larger than the sum of its proper divisors (10403245233).

21000221199 is a wasteful number, since it uses less digits than its factorization.

21000221199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680207 (or 680204 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21000221199 in words is "twenty-one billion, two hundred twenty-one thousand, one hundred ninety-nine".