1011323021 has 4 divisors (see below), whose sum is σ = 1011426012. Its totient is φ = 1011220032.

The previous prime is 1011323009. The next prime is 1011323023. The reversal of 1011323021 is 1203231101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 376786921 + 634536100 = 19411^2 + 25190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011323021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011322987 and 1011323005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011323023) 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, 35006 + ... + 56991.

It is an arithmetic number, because the mean of its divisors is an integer number (252856503).

Almost surely, 2^1011323021 is an apocalyptic number.

It is an amenable number.

1011323021 is a deficient number, since it is larger than the sum of its proper divisors (102991).

1011323021 is an equidigital number, since it uses as much as digits as its factorization.

1011323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102990.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1011323021 is about 31801.3053348444. The cubic root of 1011323021 is about 1003.7601836307.

Adding to 1011323021 its reverse (1203231101), we get a palindrome (2214554122).

The spelling of 1011323021 in words is "one billion, eleven million, three hundred twenty-three thousand, twenty-one".