1221121020299 has 4 divisors (see below), whose sum is σ = 1221124131240. Its totient is φ = 1221117909360.

The previous prime is 1221121020269. The next prime is 1221121020313. The reversal of 1221121020299 is 9920201211221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221121020299 - 2¹⁶ = 1221120954763 is a prime.

It is a super-2 number, since 2×1221121020299² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221121020269) 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 3 ways as a sum of consecutive naturals, for example, 864314 + ... + 1785855.

It is an arithmetic number, because the mean of its divisors is an integer number (305281032810).

Almost surely, 2^{1221121020299} is an apocalyptic number.

1221121020299 is a deficient number, since it is larger than the sum of its proper divisors (3110941).

1221121020299 is an equidigital number, since it uses as much as digits as its factorization.

1221121020299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110940.

The product of its (nonzero) digits is 2592, while the sum is 32.

It can be divided in two parts, 122112 and 1020299, that added together give a palindrome (1142411).

The spelling of 1221121020299 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred ninety-nine".