221111021211210 has 96 divisors (see below), whose sum is σ = 619619582247120. Its totient is φ = 54382605410304.

The previous prime is 221111021211181. The next prime is 221111021211233. The reversal of 221111021211210 is 12112120111122.

It is a happy number.

221111021211210 is a `hidden beast` number, since 2 + 211 + 1 + 10 + 21 + 211 + 210 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 110531979069561 + 110579042141649 = 10513419^2 + 10515657^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76219405 + ... + 79067184.

Almost surely, 2^{221111021211210} is an apocalyptic number.

221111021211210 is an abundant number, since it is smaller than the sum of its proper divisors (398508561035910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221111021211210 is a wasteful number, since it uses less digits than its factorization.

221111021211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155287832 (or 155287829 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221111021211210 its reverse (12112120111122), we get a palindrome (233223141322332).

The spelling of 221111021211210 in words is "two hundred twenty-one trillion, one hundred eleven billion, twenty-one million, two hundred eleven thousand, two hundred ten".