221201012109 has 32 divisors (see below), whose sum is σ = 367847055360. Its totient is φ = 114867028800.

The previous prime is 221201012093. The next prime is 221201012129. The reversal of 221201012109 is 901210102122.

It is not a de Polignac number, because 221201012109 - 2⁴ = 221201012093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201012129) 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, 451999 + ... + 804179.

It is an arithmetic number, because the mean of its divisors is an integer number (11495220480).

Almost surely, 2^221201012109 is an apocalyptic number.

It is an amenable number.

221201012109 is a deficient number, since it is larger than the sum of its proper divisors (146646043251).

221201012109 is a wasteful number, since it uses less digits than its factorization.

221201012109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354921.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 221201012109 in words is "two hundred twenty-one billion, two hundred one million, twelve thousand, one hundred nine".