1221354201 has 16 divisors (see below), whose sum is σ = 1674412544. Its totient is φ = 791316864.

The previous prime is 1221354187. The next prime is 1221354263. The reversal of 1221354201 is 1024531221.

It is not a de Polignac number, because 1221354201 - 2⁹ = 1221353689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221354271) 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, 98136 + ... + 109878.

It is an arithmetic number, because the mean of its divisors is an integer number (104650784).

Almost surely, 2^1221354201 is an apocalyptic number.

It is an amenable number.

1221354201 is a deficient number, since it is larger than the sum of its proper divisors (453058343).

1221354201 is a wasteful number, since it uses less digits than its factorization.

1221354201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12720.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1221354201 is about 34947.8783476193. The cubic root of 1221354201 is about 1068.9249402492.

Adding to 1221354201 its reverse (1024531221), we get a palindrome (2245885422).

The spelling of 1221354201 in words is "one billion, two hundred twenty-one million, three hundred fifty-four thousand, two hundred one".