1242792321 has 16 divisors (see below), whose sum is σ = 1703665920. Its totient is φ = 805407120.

The previous prime is 1242792311. The next prime is 1242792323. The reversal of 1242792321 is 1232972421.

It is not a de Polignac number, because 1242792321 - 2¹⁹ = 1242268033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1242792323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4390 + ... + 50048.

It is an arithmetic number, because the mean of its divisors is an integer number (106479120).

Almost surely, 2^1242792321 is an apocalyptic number.

It is an amenable number.

1242792321 is a deficient number, since it is larger than the sum of its proper divisors (460873599).

1242792321 is a wasteful number, since it uses less digits than its factorization.

1242792321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45916.

The product of its digits is 12096, while the sum is 33.

The square root of 1242792321 is about 35253.2597216201. The cubic root of 1242792321 is about 1075.1428895333.

The spelling of 1242792321 in words is "one billion, two hundred forty-two million, seven hundred ninety-two thousand, three hundred twenty-one".