1021243273 has 8 divisors (see below), whose sum is σ = 1057572936. Its totient is φ = 985545600.

The previous prime is 1021243271. The next prime is 1021243277. The reversal of 1021243273 is 3723421201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4717584 + 1016525689 = 2172^2 + 31883^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021243273 - 2¹ = 1021243271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021243271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154708 + ... + 161173.

It is an arithmetic number, because the mean of its divisors is an integer number (132196617).

Almost surely, 2^1021243273 is an apocalyptic number.

It is an amenable number.

1021243273 is a deficient number, since it is larger than the sum of its proper divisors (36329663).

1021243273 is an equidigital number, since it uses as much as digits as its factorization.

1021243273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315995.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1021243273 is about 31956.8971115783. The cubic root of 1021243273 is about 1007.0315326630.

Adding to 1021243273 its reverse (3723421201), we get a palindrome (4744664474).

The spelling of 1021243273 in words is "one billion, twenty-one million, two hundred forty-three thousand, two hundred seventy-three".