221907399145 has 16 divisors (see below), whose sum is σ = 267942904128. Its totient is φ = 176426050240.

The previous prime is 221907399139. The next prime is 221907399167. The reversal of 221907399145 is 541993709122.

It is not a de Polignac number, because 221907399145 - 2⁹ = 221907398633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221907399092 and 221907399101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456690 + ... + 807700.

It is an arithmetic number, because the mean of its divisors is an integer number (16746431508).

Almost surely, 2^221907399145 is an apocalyptic number.

It is an amenable number.

221907399145 is a deficient number, since it is larger than the sum of its proper divisors (46035504983).

221907399145 is a wasteful number, since it uses less digits than its factorization.

221907399145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351800.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 221907399145 in words is "two hundred twenty-one billion, nine hundred seven million, three hundred ninety-nine thousand, one hundred forty-five".