221038396999 has 32 divisors (see below), whose sum is σ = 273281734656. Its totient is φ = 174448780800.

The previous prime is 221038396961. The next prime is 221038397009. The reversal of 221038396999 is 999693830122.

It is not a de Polignac number, because 221038396999 - 2⁷ = 221038396871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221038396949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15893949 + ... + 15907849.

It is an arithmetic number, because the mean of its divisors is an integer number (8540054208).

Almost surely, 2^221038396999 is an apocalyptic number.

221038396999 is a deficient number, since it is larger than the sum of its proper divisors (52243337657).

221038396999 is a wasteful number, since it uses less digits than its factorization.

221038396999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16815.

The product of its (nonzero) digits is 11337408, while the sum is 61.

The spelling of 221038396999 in words is "two hundred twenty-one billion, thirty-eight million, three hundred ninety-six thousand, nine hundred ninety-nine".