1021130021 has 4 divisors (see below), whose sum is σ = 1021208544. Its totient is φ = 1021051500.

The previous prime is 1021130003. The next prime is 1021130029. The reversal of 1021130021 is 1200311201.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021130021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021129984 and 1021130011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021130029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14585 + ... + 47486.

It is an arithmetic number, because the mean of its divisors is an integer number (255302136).

Almost surely, 2^1021130021 is an apocalyptic number.

It is an amenable number.

1021130021 is a deficient number, since it is larger than the sum of its proper divisors (78523).

1021130021 is an equidigital number, since it uses as much as digits as its factorization.

1021130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78522.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1021130021 is about 31955.1251131958. The cubic root of 1021130021 is about 1006.9943059629.

Adding to 1021130021 its reverse (1200311201), we get a palindrome (2221441222).

The spelling of 1021130021 in words is "one billion, twenty-one million, one hundred thirty thousand, twenty-one".