1221429715 has 8 divisors (see below), whose sum is σ = 1598962608. Its totient is φ = 888312480.

The previous prime is 1221429709. The next prime is 1221429731. The reversal of 1221429715 is 5179241221.

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

It is not a de Polignac number, because 1221429715 - 2³ = 1221429707 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11103852 + ... + 11103961.

It is an arithmetic number, because the mean of its divisors is an integer number (199870326).

Almost surely, 2^1221429715 is an apocalyptic number.

1221429715 is a deficient number, since it is larger than the sum of its proper divisors (377532893).

1221429715 is a wasteful number, since it uses less digits than its factorization.

1221429715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22207829.

The product of its digits is 10080, while the sum is 34.

The square root of 1221429715 is about 34948.9587112406. The cubic root of 1221429715 is about 1068.9469696584.

The spelling of 1221429715 in words is "one billion, two hundred twenty-one million, four hundred twenty-nine thousand, seven hundred fifteen".