1021221243 has 32 divisors (see below), whose sum is σ = 1739712000. Its totient is φ = 579957408.

The previous prime is 1021221239. The next prime is 1021221247. The reversal of 1021221243 is 3421221201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1021221239) and next prime (1021221247).

It is not a de Polignac number, because 1021221243 - 2² = 1021221239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021221247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14233 + ... + 47381.

It is an arithmetic number, because the mean of its divisors is an integer number (54366000).

Almost surely, 2^1021221243 is an apocalyptic number.

1021221243 is a deficient number, since it is larger than the sum of its proper divisors (718490757).

1021221243 is a wasteful number, since it uses less digits than its factorization.

1021221243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33328 (or 33322 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1021221243 is about 31956.5524266933. The cubic root of 1021221243 is about 1007.0242914683.

Adding to 1021221243 its reverse (3421221201), we get a palindrome (4442442444).

The spelling of 1021221243 in words is "one billion, twenty-one million, two hundred twenty-one thousand, two hundred forty-three".