1221121020201 has 16 divisors (see below), whose sum is σ = 1724770344000. Its totient is φ = 766322002368.

The previous prime is 1221121020193. The next prime is 1221121020247. The reversal of 1221121020201 is 1020201211221.

It is not a de Polignac number, because 1221121020201 - 2³ = 1221121020193 is a prime.

It is a super-2 number, since 2×1221121020201² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221121020001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68217726 + ... + 68235623.

It is an arithmetic number, because the mean of its divisors is an integer number (107798146500).

Almost surely, 2^{1221121020201} is an apocalyptic number.

It is an amenable number.

1221121020201 is a deficient number, since it is larger than the sum of its proper divisors (503649323799).

1221121020201 is a wasteful number, since it uses less digits than its factorization.

1221121020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136453528.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221121020201 its reverse (1020201211221), we get a palindrome (2241322231422).

The spelling of 1221121020201 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred one".