1221101120201 has 8 divisors (see below), whose sum is σ = 1233418599624. Its totient is φ = 1208788099200.

The previous prime is 1221101120189. The next prime is 1221101120233. The reversal of 1221101120201 is 1020211011221.

It can be written as a sum of positive squares in 4 ways, for example, as 425260494400 + 795840625801 = 652120^2 + 892099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221101120201 - 2¹⁰ = 1221101119177 is a prime.

It is a super-2 number, since 2×1221101120201² (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 (1221101120401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562700 + ... + 1660973.

It is an arithmetic number, because the mean of its divisors is an integer number (154177324953).

Almost surely, 2^{1221101120201} is an apocalyptic number.

It is an amenable number.

1221101120201 is a deficient number, since it is larger than the sum of its proper divisors (12317479423).

1221101120201 is a wasteful number, since it uses less digits than its factorization.

1221101120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229211.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221101120201 its reverse (1020211011221), we get a palindrome (2241312131422).

The spelling of 1221101120201 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred twenty thousand, two hundred one".