1023211021 has 4 divisors (see below), whose sum is σ = 1169384032. Its totient is φ = 877038012.

The previous prime is 1023211019. The next prime is 1023211027. The reversal of 1023211021 is 1201123201.

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 1023211021 - 2¹ = 1023211019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023210992 and 1023211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023211027) 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 3 ways as a sum of consecutive naturals, for example, 73086495 + ... + 73086508.

It is an arithmetic number, because the mean of its divisors is an integer number (292346008).

Almost surely, 2^1023211021 is an apocalyptic number.

It is an amenable number.

1023211021 is a deficient number, since it is larger than the sum of its proper divisors (146173011).

1023211021 is an equidigital number, since it uses as much as digits as its factorization.

1023211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146173010.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1023211021 is about 31987.6698276070. The cubic root of 1023211021 is about 1007.6779058897.

Adding to 1023211021 its reverse (1201123201), we get a palindrome (2224334222).

It can be divided in two parts, 102 and 3211021, that added together give a palindrome (3211123).

The spelling of 1023211021 in words is "one billion, twenty-three million, two hundred eleven thousand, twenty-one".