1221434201 has 8 divisors (see below), whose sum is σ = 1315823880. Its totient is φ = 1127106432.

The previous prime is 1221434161. The next prime is 1221434213. The reversal of 1221434201 is 1024341221.

It can be written as a sum of positive squares in 4 ways, for example, as 179694025 + 1041740176 = 13405^2 + 32276^2 .

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 1221434201 - 2¹⁴ = 1221417817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221434701) 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, 30605 + ... + 58133.

It is an arithmetic number, because the mean of its divisors is an integer number (164477985).

Almost surely, 2^1221434201 is an apocalyptic number.

It is an amenable number.

1221434201 is a deficient number, since it is larger than the sum of its proper divisors (94389679).

1221434201 is a wasteful number, since it uses less digits than its factorization.

1221434201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30955.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221434201 is about 34949.0228904901. The cubic root of 1221434201 is about 1068.9482783134.

Adding to 1221434201 its reverse (1024341221), we get a palindrome (2245775422).

The spelling of 1221434201 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, two hundred one".