21000221100999 has 24 divisors (see below), whose sum is σ = 35785323005952. Its totient is φ = 11613025492560.

The previous prime is 21000221100941. The next prime is 21000221101009. The reversal of 21000221100999 is 99900112200012.

It is not a de Polignac number, because 21000221100999 - 2⁷ = 21000221100871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221102999) 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, 5376398739 + ... + 5376402644.

It is an arithmetic number, because the mean of its divisors is an integer number (1491055125248).

Almost surely, 2^{21000221100999} is an apocalyptic number.

21000221100999 is a deficient number, since it is larger than the sum of its proper divisors (14785101904953).

21000221100999 is a wasteful number, since it uses less digits than its factorization.

21000221100999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10752801427 (or 10752801424 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 21000221100999 in words is "twenty-one trillion, two hundred twenty-one million, one hundred thousand, nine hundred ninety-nine".