1215201201 has 4 divisors (see below), whose sum is σ = 1620268272. Its totient is φ = 810134132.

The previous prime is 1215201193. The next prime is 1215201241. The reversal of 1215201201 is 1021025121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1021025121 = 3 ⋅340341707.

It is a cyclic number.

It is not a de Polignac number, because 1215201201 - 2³ = 1215201193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215201241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202533531 + ... + 202533536.

It is an arithmetic number, because the mean of its divisors is an integer number (405067068).

Almost surely, 2^1215201201 is an apocalyptic number.

It is an amenable number.

1215201201 is a deficient number, since it is larger than the sum of its proper divisors (405067071).

1215201201 is an equidigital number, since it uses as much as digits as its factorization.

1215201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405067070.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1215201201 is about 34859.7361005502. The cubic root of 1215201201 is about 1067.1268893709.

Adding to 1215201201 its reverse (1021025121), we get a palindrome (2236226322).

The spelling of 1215201201 in words is "one billion, two hundred fifteen million, two hundred one thousand, two hundred one".