1011323212021 has 4 divisors (see below), whose sum is σ = 1011348187200. Its totient is φ = 1011298236844.

The previous prime is 1011323211953. The next prime is 1011323212043. The reversal of 1011323212021 is 1202123231101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1011323212021 - 2¹⁹ = 1011322687733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011323212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011323212421) 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, 12426751 + ... + 12507868.

It is an arithmetic number, because the mean of its divisors is an integer number (252837046800).

Almost surely, 2^{1011323212021} is an apocalyptic number.

It is an amenable number.

1011323212021 is a deficient number, since it is larger than the sum of its proper divisors (24975179).

1011323212021 is an equidigital number, since it uses as much as digits as its factorization.

1011323212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24975178.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1011323212021 its reverse (1202123231101), we get a palindrome (2213446443122).

The spelling of 1011323212021 in words is "one trillion, eleven billion, three hundred twenty-three million, two hundred twelve thousand, twenty-one".