221200121212209 has 48 divisors (see below), whose sum is σ = 330740803461120. Its totient is φ = 142310629369440.

The previous prime is 221200121212163. The next prime is 221200121212211. The reversal of 221200121212209 is 902212121002122.

221200121212209 is a `hidden beast` number, since 2 + 2 + 120 + 0 + 121 + 212 + 209 = 666.

It is not a de Polignac number, because 221200121212209 - 2¹⁵ = 221200121179441 is a prime.

It is a super-2 number, since 2×221200121212209² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221200121212909) 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, 679434664 + ... + 679760150.

It is an arithmetic number, because the mean of its divisors is an integer number (6890433405440).

Almost surely, 2^{221200121212209} is an apocalyptic number.

It is an amenable number.

221200121212209 is a deficient number, since it is larger than the sum of its proper divisors (109540682248911).

221200121212209 is a wasteful number, since it uses less digits than its factorization.

221200121212209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332330 (or 332327 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 221200121212209 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred twelve thousand, two hundred nine".