1021142243 has 16 divisors (see below), whose sum is σ = 1161187584. Its totient is φ = 889716960.

The previous prime is 1021142203. The next prime is 1021142267. The reversal of 1021142243 is 3422411201.

It is not a de Polignac number, because 1021142243 - 2¹⁸ = 1020880099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021142203) 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, 8546 + ... + 45992.

It is an arithmetic number, because the mean of its divisors is an integer number (72574224).

Almost surely, 2^1021142243 is an apocalyptic number.

1021142243 is a deficient number, since it is larger than the sum of its proper divisors (140045341).

1021142243 is a wasteful number, since it uses less digits than its factorization.

1021142243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37562.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1021142243 is about 31955.3163495529. The cubic root of 1021142243 is about 1006.9983235496.

Adding to 1021142243 its reverse (3422411201), we get a palindrome (4443553444).

The spelling of 1021142243 in words is "one billion, twenty-one million, one hundred forty-two thousand, two hundred forty-three".