1021203678 has 64 divisors (see below), whose sum is σ = 2351462400. Its totient is φ = 292404960.

The previous prime is 1021203661. The next prime is 1021203679. The reversal of 1021203678 is 8763021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021203679) 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 31 ways as a sum of consecutive naturals, for example, 629953 + ... + 631571.

It is an arithmetic number, because the mean of its divisors is an integer number (36741600).

Almost surely, 2^1021203678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021203678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175731200).

1021203678 is an abundant number, since it is smaller than the sum of its proper divisors (1330258722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021203678 is a wasteful number, since it uses less digits than its factorization.

1021203678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1021203678 is about 31956.2775992449. The cubic root of 1021203678 is about 1007.0185178310.

Adding to 1021203678 its reverse (8763021201), we get a palindrome (9784224879).

The spelling of 1021203678 in words is "one billion, twenty-one million, two hundred three thousand, six hundred seventy-eight".