1021657343 has 4 divisors (see below), whose sum is σ = 1167608400. Its totient is φ = 875706288.

The previous prime is 1021657331. The next prime is 1021657391. The reversal of 1021657343 is 3437561201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3437561201 = 31 ⋅110889071.

It is a cyclic number.

It is not a de Polignac number, because 1021657343 - 2²⁰ = 1020608767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021657243) 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, 72975518 + ... + 72975531.

It is an arithmetic number, because the mean of its divisors is an integer number (291902100).

Almost surely, 2^1021657343 is an apocalyptic number.

1021657343 is a deficient number, since it is larger than the sum of its proper divisors (145951057).

1021657343 is an equidigital number, since it uses as much as digits as its factorization.

1021657343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145951056.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1021657343 is about 31963.3750251753. The cubic root of 1021657343 is about 1007.1676168571.

The spelling of 1021657343 in words is "one billion, twenty-one million, six hundred fifty-seven thousand, three hundred forty-three".