221121221001222 has 16 divisors (see below), whose sum is σ = 442362845651760. Its totient is φ = 73687006392192.

The previous prime is 221121221001181. The next prime is 221121221001223. The reversal of 221121221001222 is 222100122121122.

It is a super-2 number, since 2×221121221001222² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121221001223) 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, 5016794847 + ... + 5016838922.

It is an arithmetic number, because the mean of its divisors is an integer number (27647677853235).

Almost surely, 2^{221121221001222} is an apocalyptic number.

221121221001222 is an abundant number, since it is smaller than the sum of its proper divisors (221241624650538).

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

221121221001222 is a wasteful number, since it uses less digits than its factorization.

221121221001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10033637447.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221121221001222 its reverse (222100122121122), we get a palindrome (443221343122344).

The spelling of 221121221001222 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, one thousand, two hundred twenty-two".