921071243 has 4 divisors (see below), whose sum is σ = 936682680. Its totient is φ = 905459808.

The previous prime is 921071219. The next prime is 921071257. The reversal of 921071243 is 342170129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342170129 = 7 ⋅48881447.

It is a cyclic number.

It is not a de Polignac number, because 921071243 - 2⁸ = 921070987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921071293) 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, 7805630 + ... + 7805747.

It is an arithmetic number, because the mean of its divisors is an integer number (234170670).

Almost surely, 2^921071243 is an apocalyptic number.

921071243 is a deficient number, since it is larger than the sum of its proper divisors (15611437).

921071243 is a wasteful number, since it uses less digits than its factorization.

921071243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611436.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 921071243 is about 30349.1555566213. The cubic root of 921071243 is about 972.9661721780.

The spelling of 921071243 in words is "nine hundred twenty-one million, seventy-one thousand, two hundred forty-three".