1221132670 has 16 divisors (see below), whose sum is σ = 2206401120. Its totient is φ = 486594784.

The previous prime is 1221132637. The next prime is 1221132683. The reversal of 1221132670 is 762311221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229525 + ... + 234784.

It is an arithmetic number, because the mean of its divisors is an integer number (137900070).

Almost surely, 2^1221132670 is an apocalyptic number.

1221132670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221132670 is a deficient number, since it is larger than the sum of its proper divisors (985268450).

1221132670 is a wasteful number, since it uses less digits than its factorization.

1221132670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464579.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1221132670 is about 34944.7087554039. The cubic root of 1221132670 is about 1068.8603086216.

Adding to 1221132670 its reverse (762311221), we get a palindrome (1983443891).

The spelling of 1221132670 in words is "one billion, two hundred twenty-one million, one hundred thirty-two thousand, six hundred seventy".