1021200243 has 16 divisors (see below), whose sum is σ = 1594070016. Its totient is φ = 569309760.

The previous prime is 1021200241. The next prime is 1021200247. The reversal of 1021200243 is 3420021201.

It is not a de Polignac number, because 1021200243 - 2¹ = 1021200241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021200241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 592171 + ... + 593892.

It is an arithmetic number, because the mean of its divisors is an integer number (99629376).

Almost surely, 2^1021200243 is an apocalyptic number.

1021200243 is a deficient number, since it is larger than the sum of its proper divisors (572869773).

1021200243 is a wasteful number, since it uses less digits than its factorization.

1021200243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186114.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1021200243 is about 31956.2238538911. The cubic root of 1021200243 is about 1007.0173887345.

Adding to 1021200243 its reverse (3420021201), we get a palindrome (4441221444).

The spelling of 1021200243 in words is "one billion, twenty-one million, two hundred thousand, two hundred forty-three".