221212021111211 has 16 divisors (see below), whose sum is σ = 249847942284864. Its totient is φ = 194326177229184.

The previous prime is 221212021111183. The next prime is 221212021111229. The reversal of 221212021111211 is 112111120212122.

It is a happy number.

It is not a de Polignac number, because 221212021111211 - 2²² = 221212016916907 is a prime.

It is a super-2 number, since 2×221212021111211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212021111231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1877706416 + ... + 1877824221.

It is an arithmetic number, because the mean of its divisors is an integer number (15615496392804).

Almost surely, 2^{221212021111211} is an apocalyptic number.

221212021111211 is a deficient number, since it is larger than the sum of its proper divisors (28635921173653).

221212021111211 is a wasteful number, since it uses less digits than its factorization.

221212021111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3755530870.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221212021111211 its reverse (112111120212122), we get a palindrome (333323141323333).

The spelling of 221212021111211 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, one hundred eleven thousand, two hundred eleven".