1221294673 has 8 divisors (see below), whose sum is σ = 1288819520. Its totient is φ = 1154094480.

The previous prime is 1221294653. The next prime is 1221294677. The reversal of 1221294673 is 3764921221.

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 1221294673 - 2²¹ = 1219197521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221294677) 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, 73413 + ... + 88498.

It is an arithmetic number, because the mean of its divisors is an integer number (161102440).

Almost surely, 2^1221294673 is an apocalyptic number.

It is an amenable number.

1221294673 is a deficient number, since it is larger than the sum of its proper divisors (67524847).

1221294673 is a wasteful number, since it uses less digits than its factorization.

1221294673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162327.

The product of its digits is 36288, while the sum is 37.

The square root of 1221294673 is about 34947.0266689457. The cubic root of 1221294673 is about 1068.9075737343.

The spelling of 1221294673 in words is "one billion, two hundred twenty-one million, two hundred ninety-four thousand, six hundred seventy-three".