1221032221122 has 32 divisors (see below), whose sum is σ = 2791140867072. Its totient is φ = 348840089424.

The previous prime is 1221032221111. The next prime is 1221032221127. The reversal of 1221032221122 is 2211222301221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1221032221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526048 + ... + 1648875.

It is an arithmetic number, because the mean of its divisors is an integer number (87223152096).

Almost surely, 2^{1221032221122} is an apocalyptic number.

1221032221122 is an abundant number, since it is smaller than the sum of its proper divisors (1570108645950).

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

1221032221122 is a wasteful number, since it uses less digits than its factorization.

1221032221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188302.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221032221122 its reverse (2211222301221), we get a palindrome (3432254522343).

The spelling of 1221032221122 in words is "one trillion, two hundred twenty-one billion, thirty-two million, two hundred twenty-one thousand, one hundred twenty-two".