1221120201 has 16 divisors (see below), whose sum is σ = 1865836544. Its totient is φ = 695877264.

The previous prime is 1221120193. The next prime is 1221120211. The reversal of 1221120201 is 1020211221.

It is not a de Polignac number, because 1221120201 - 2³ = 1221120193 is a prime.

It is a super-2 number, since 2×1221120201² = 2982269090580560802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221120211) 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, 71515 + ... + 86928.

It is an arithmetic number, because the mean of its divisors is an integer number (116614784).

Almost surely, 2^1221120201 is an apocalyptic number.

It is an amenable number.

1221120201 is a deficient number, since it is larger than the sum of its proper divisors (644716343).

1221120201 is a wasteful number, since it uses less digits than its factorization.

1221120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158820.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221120201 is about 34944.5303445332. The cubic root of 1221120201 is about 1068.8566705609.

Adding to 1221120201 its reverse (1020211221), we get a palindrome (2241331422).

The spelling of 1221120201 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred one".