1221365146 has 8 divisors (see below), whose sum is σ = 1857851424. Its totient is φ = 602081340.

The previous prime is 1221365143. The next prime is 1221365147. The reversal of 1221365146 is 6415631221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221365143) 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, 4300440 + ... + 4300723.

It is an arithmetic number, because the mean of its divisors is an integer number (232231428).

Almost surely, 2^1221365146 is an apocalyptic number.

1221365146 is a deficient number, since it is larger than the sum of its proper divisors (636486278).

1221365146 is an equidigital number, since it uses as much as digits as its factorization.

1221365146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8601236.

The product of its digits is 8640, while the sum is 31.

The square root of 1221365146 is about 34948.0349376041. The cubic root of 1221365146 is about 1068.9281332483.

Adding to 1221365146 its reverse (6415631221), we get a palindrome (7636996367).

The spelling of 1221365146 in words is "one billion, two hundred twenty-one million, three hundred sixty-five thousand, one hundred forty-six".