1221134646 has 32 divisors (see below), whose sum is σ = 2479183200. Its totient is φ = 400928000.

The previous prime is 1221134627. The next prime is 1221134669. The reversal of 1221134646 is 6464311221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139396 + ... + 147896.

It is an arithmetic number, because the mean of its divisors is an integer number (77474475).

Almost surely, 2^1221134646 is an apocalyptic number.

1221134646 is an abundant number, since it is smaller than the sum of its proper divisors (1258048554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221134646 is a wasteful number, since it uses less digits than its factorization.

1221134646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8864.

The product of its digits is 6912, while the sum is 30.

The square root of 1221134646 is about 34944.7370286285. The cubic root of 1221134646 is about 1068.8608851538.

Adding to 1221134646 its reverse (6464311221), we get a palindrome (7685445867).

The spelling of 1221134646 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, six hundred forty-six".