221021199999999 has 48 divisors (see below), whose sum is σ = 370493202942720. Its totient is φ = 124349915162880.

The previous prime is 221021199999989. The next prime is 221021200000021. The reversal of 221021199999999 is 999999991120122.

221021199999999 is a `hidden beast` number, since 221 + 0 + 211 + 9 + 9 + 9 + 9 + 99 + 99 = 666.

It is not a de Polignac number, because 221021199999999 - 2⁴ = 221021199999983 is a prime.

221021199999999 is a modest number, since divided by 99999999 gives 2210211 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021199999959) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4876122 + ... + 21582839.

It is an arithmetic number, because the mean of its divisors is an integer number (7718608394640).

Almost surely, 2^{221021199999999} is an apocalyptic number.

221021199999999 is a deficient number, since it is larger than the sum of its proper divisors (149472002942721).

221021199999999 is a wasteful number, since it uses less digits than its factorization.

221021199999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26461020 (or 26461017 counting only the distinct ones).

The product of its (nonzero) digits is 344373768, while the sum is 81.

The spelling of 221021199999999 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".