1221134201 has 16 divisors (see below), whose sum is σ = 1445713920. Its totient is φ = 1009662720.

The previous prime is 1221134197. The next prime is 1221134207. The reversal of 1221134201 is 1024311221.

It is not a de Polignac number, because 1221134201 - 2² = 1221134197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221134201.

It is not an unprimeable number, because it can be changed into a prime (1221134207) 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, 1640 + ... + 49446.

It is an arithmetic number, because the mean of its divisors is an integer number (90357120).

Almost surely, 2^1221134201 is an apocalyptic number.

It is an amenable number.

1221134201 is a deficient number, since it is larger than the sum of its proper divisors (224579719).

1221134201 is an equidigital number, since it uses as much as digits as its factorization.

1221134201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47944.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1221134201 is about 34944.7306614316. The cubic root of 1221134201 is about 1068.8607553174.

Adding to 1221134201 its reverse (1024311221), we get a palindrome (2245445422).

The spelling of 1221134201 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, two hundred one".