1023021011 has 4 divisors (see below), whose sum is σ = 1028321832. Its totient is φ = 1017720192.

The previous prime is 1023020993. The next prime is 1023021101. The reversal of 1023021011 is 1101203201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023020983 and 1023021001.

It is not an unprimeable number, because it can be changed into a prime (1023023011) 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, 2650121 + ... + 2650506.

It is an arithmetic number, because the mean of its divisors is an integer number (257080458).

Almost surely, 2^1023021011 is an apocalyptic number.

1023021011 is a deficient number, since it is larger than the sum of its proper divisors (5300821).

1023021011 is an equidigital number, since it uses as much as digits as its factorization.

1023021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300820.

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

The square root of 1023021011 is about 31984.6996390462. The cubic root of 1023021011 is about 1007.6155268600.

Adding to 1023021011 its reverse (1101203201), we get a palindrome (2124224212).

The spelling of 1023021011 in words is "one billion, twenty-three million, twenty-one thousand, eleven".