1221434204 has 6 divisors (see below), whose sum is σ = 2137509864. Its totient is φ = 610717100.

The previous prime is 1221434161. The next prime is 1221434213. The reversal of 1221434204 is 4024341221.

It is a super-2 number, since 2×1221434204² = 2983803029402227232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221434204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152679272 + ... + 152679279.

It is an arithmetic number, because the mean of its divisors is an integer number (356251644).

Almost surely, 2^1221434204 is an apocalyptic number.

It is an amenable number.

1221434204 is a deficient number, since it is larger than the sum of its proper divisors (916075660).

1221434204 is a wasteful number, since it uses less digits than its factorization.

1221434204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305358555 (or 305358553 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1221434204 is about 34949.0229334097. The cubic root of 1221434204 is about 1068.9482791885.

Adding to 1221434204 its reverse (4024341221), we get a palindrome (5245775425).

The spelling of 1221434204 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, two hundred four".