221211012212009 has 4 divisors (see below), whose sum is σ = 221246197682304. Its totient is φ = 221175826741716.

The previous prime is 221211012211927. The next prime is 221211012212027. The reversal of 221211012212009 is 900212210112122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221211012212009 - 2⁸ = 221211012211753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211012212059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17592725717 + ... + 17592738290.

It is an arithmetic number, because the mean of its divisors is an integer number (55311549420576).

Almost surely, 2^{221211012212009} is an apocalyptic number.

It is an amenable number.

221211012212009 is a deficient number, since it is larger than the sum of its proper divisors (35185470295).

221211012212009 is an equidigital number, since it uses as much as digits as its factorization.

221211012212009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35185470294.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 221211012212009 in words is "two hundred twenty-one trillion, two hundred eleven billion, twelve million, two hundred twelve thousand, nine".