1221120202001 has 32 divisors (see below), whose sum is σ = 1459096396800. Its totient is φ = 1020924172800.

The previous prime is 1221120201943. The next prime is 1221120202063. The reversal of 1221120202001 is 1002020211221.

It is a de Polignac number, because none of the positive numbers 2^k-1221120202001 is a prime.

It is a super-2 number, since 2×1221120202001² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221120202501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112737656 + ... + 112748486.

It is an arithmetic number, because the mean of its divisors is an integer number (45596762400).

Almost surely, 2^{1221120202001} is an apocalyptic number.

It is an amenable number.

1221120202001 is a deficient number, since it is larger than the sum of its proper divisors (237976194799).

1221120202001 is an equidigital number, since it uses as much as digits as its factorization.

1221120202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18910 (or 18896 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221120202001 its reverse (1002020211221), we get a palindrome (2223140413222).

The spelling of 1221120202001 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred two thousand, one".