1021203543 has 4 divisors (see below), whose sum is σ = 1361604728. Its totient is φ = 680802360.

The previous prime is 1021203541. The next prime is 1021203553. The reversal of 1021203543 is 3453021201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1021203543 - 2¹ = 1021203541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021203541) 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, 170200588 + ... + 170200593.

It is an arithmetic number, because the mean of its divisors is an integer number (340401182).

Almost surely, 2^1021203543 is an apocalyptic number.

1021203543 is a deficient number, since it is larger than the sum of its proper divisors (340401185).

1021203543 is an equidigital number, since it uses as much as digits as its factorization.

1021203543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340401184.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1021203543 is about 31956.2754869838. The cubic root of 1021203543 is about 1007.0184734561.

Adding to 1021203543 its reverse (3453021201), we get a palindrome (4474224744).

The spelling of 1021203543 in words is "one billion, twenty-one million, two hundred three thousand, five hundred forty-three".