1221122021122 has 4 divisors (see below), whose sum is σ = 1831683031686. Its totient is φ = 610561010560.

The previous prime is 1221122021113. The next prime is 1221122021123. The reversal of 1221122021122 is 2211202211221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 876565935001 + 344556086121 = 936251^2 + 586989^2 .

It is a super-2 number, since 2×1221122021122² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221122021122.

It is not an unprimeable number, because it can be changed into a prime (1221122021123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305280505279 + ... + 305280505282.

Almost surely, 2^{1221122021122} is an apocalyptic number.

1221122021122 is a deficient number, since it is larger than the sum of its proper divisors (610561010564).

1221122021122 is an equidigital number, since it uses as much as digits as its factorization.

1221122021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610561010563.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221122021122 its reverse (2211202211221), we get a palindrome (3432324232343).

The spelling of 1221122021122 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty-two".