1221210201 has 8 divisors (see below), whose sum is σ = 1629548640. Its totient is φ = 813505952.

The previous prime is 1221210173. The next prime is 1221210209. The reversal of 1221210201 is 1020121221.

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 1221210201 - 2⁵ = 1221210169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221210209) 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, 154035 + ... + 161768.

It is an arithmetic number, because the mean of its divisors is an integer number (203693580).

Almost surely, 2^1221210201 is an apocalyptic number.

It is an amenable number.

1221210201 is a deficient number, since it is larger than the sum of its proper divisors (408338439).

1221210201 is a wasteful number, since it uses less digits than its factorization.

1221210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317095.

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

The square root of 1221210201 is about 34945.8180759873. The cubic root of 1221210201 is about 1068.8829291654.

Adding to 1221210201 its reverse (1020121221), we get a palindrome (2241331422).

The spelling of 1221210201 in words is "one billion, two hundred twenty-one million, two hundred ten thousand, two hundred one".