211221211101222 has 32 divisors (see below), whose sum is σ = 487220618016000. Its totient is φ = 59795257663008.

The previous prime is 211221211101221. The next prime is 211221211101247. The reversal of 211221211101222 is 222101112122112.

It is a super-2 number, since 2×211221211101222² (a number of 29 digits) contains 22 as substring.

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 (211221211101221) 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, 23069153472 + ... + 23069162627.

It is an arithmetic number, because the mean of its divisors is an integer number (15225644313000).

Almost surely, 2^{211221211101222} is an apocalyptic number.

211221211101222 is an abundant number, since it is smaller than the sum of its proper divisors (275999406914778).

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

211221211101222 is a wasteful number, since it uses less digits than its factorization.

211221211101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46138316220.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211221211101222 its reverse (222101112122112), we get a palindrome (433322323223334).

The spelling of 211221211101222 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred one thousand, two hundred twenty-two".