221211011228 has 24 divisors (see below), whose sum is σ = 392934906000. Its totient is φ = 108944212608.

The previous prime is 221211011221. The next prime is 221211011237. The reversal of 221211011228 is 822110112122.

It is a super-2 number, since 2×221211011228² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211011221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3270698 + ... + 3337646.

It is an arithmetic number, because the mean of its divisors is an integer number (16372287750).

Almost surely, 2^221211011228 is an apocalyptic number.

It is an amenable number.

221211011228 is a deficient number, since it is larger than the sum of its proper divisors (171723894772).

221211011228 is a wasteful number, since it uses less digits than its factorization.

221211011228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79349 (or 79347 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 221211011228 in words is "two hundred twenty-one billion, two hundred eleven million, eleven thousand, two hundred twenty-eight".