1021813423 has 8 divisors (see below), whose sum is σ = 1060252592. Its totient is φ = 983943936.

The previous prime is 1021813411. The next prime is 1021813427. The reversal of 1021813423 is 3243181201.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021813423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021813427) 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 7 ways as a sum of consecutive naturals, for example, 138765 + ... + 145942.

It is an arithmetic number, because the mean of its divisors is an integer number (132531574).

Almost surely, 2^1021813423 is an apocalyptic number.

1021813423 is a deficient number, since it is larger than the sum of its proper divisors (38439169).

1021813423 is an equidigital number, since it uses as much as digits as its factorization.

1021813423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284841.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1021813423 is about 31965.8164763549. The cubic root of 1021813423 is about 1007.2189030404.

Adding to 1021813423 its reverse (3243181201), we get a palindrome (4264994624).

The spelling of 1021813423 in words is "one billion, twenty-one million, eight hundred thirteen thousand, four hundred twenty-three".