1079216921 has 4 divisors (see below), whose sum is σ = 1081337700. Its totient is φ = 1077096144.

The previous prime is 1079216911. The next prime is 1079216927. The reversal of 1079216921 is 1296129701.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1296129701 = 877 ⋅1477913.

It can be written as a sum of positive squares in 2 ways, for example, as 750157321 + 329059600 = 27389^2 + 18140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1079216921 - 2¹⁸ = 1078954777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1079216927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1059626 + ... + 1060643.

It is an arithmetic number, because the mean of its divisors is an integer number (270334425).

Almost surely, 2^1079216921 is an apocalyptic number.

It is an amenable number.

1079216921 is a deficient number, since it is larger than the sum of its proper divisors (2120779).

1079216921 is an equidigital number, since it uses as much as digits as its factorization.

1079216921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120778.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 1079216921 is about 32851.4371222934. The cubic root of 1079216921 is about 1025.7375365208.

The spelling of 1079216921 in words is "one billion, seventy-nine million, two hundred sixteen thousand, nine hundred twenty-one".