1023312200021 has 4 divisors (see below), whose sum is σ = 1023610284492. Its totient is φ = 1023014115552.

The previous prime is 1023312199999. The next prime is 1023312200069. The reversal of 1023312200021 is 1200022133201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174544306225 + 848767893796 = 417785^2 + 921286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023312200021 - 2¹⁸ = 1023311937877 is a prime.

It is a super-2 number, since 2×1023312200021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023312230021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149037086 + ... + 149043951.

It is an arithmetic number, because the mean of its divisors is an integer number (255902571123).

Almost surely, 2^{1023312200021} is an apocalyptic number.

It is an amenable number.

1023312200021 is a deficient number, since it is larger than the sum of its proper divisors (298084471).

1023312200021 is an equidigital number, since it uses as much as digits as its factorization.

1023312200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298084470.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1023312200021 its reverse (1200022133201), we get a palindrome (2223334333222).

The spelling of 1023312200021 in words is "one trillion, twenty-three billion, three hundred twelve million, two hundred thousand, twenty-one".