1221450205 has 8 divisors (see below), whose sum is σ = 1484294400. Its totient is φ = 964790736.

The previous prime is 1221450203. The next prime is 1221450211. The reversal of 1221450205 is 5020541221.

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 1221450205 - 2¹ = 1221450203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221450203) 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, 1545745 + ... + 1546534.

It is an arithmetic number, because the mean of its divisors is an integer number (185536800).

Almost surely, 2^1221450205 is an apocalyptic number.

It is an amenable number.

1221450205 is a deficient number, since it is larger than the sum of its proper divisors (262844195).

1221450205 is an equidigital number, since it uses as much as digits as its factorization.

1221450205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092363.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1221450205 is about 34949.2518517922. The cubic root of 1221450205 is about 1068.9529469708.

Adding to 1221450205 its reverse (5020541221), we get a palindrome (6241991426).

The spelling of 1221450205 in words is "one billion, two hundred twenty-one million, four hundred fifty thousand, two hundred five".