23020012021 has 4 divisors (see below), whose sum is σ = 23022751500. Its totient is φ = 23017272544.

The previous prime is 23020012009. The next prime is 23020012087. The reversal of 23020012021 is 12021002032.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1089660100 + 21930351921 = 33010^2 + 148089^2 .

It is a cyclic number.

It is not a de Polignac number, because 23020012021 - 2¹³ = 23020003829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23020011992 and 23020012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23020012321) 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, 1357096 + ... + 1373953.

It is an arithmetic number, because the mean of its divisors is an integer number (5755687875).

Almost surely, 2^23020012021 is an apocalyptic number.

It is an amenable number.

23020012021 is a deficient number, since it is larger than the sum of its proper divisors (2739479).

23020012021 is an equidigital number, since it uses as much as digits as its factorization.

23020012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739478.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 23020012021 its reverse (12021002032), we get a palindrome (35041014053).

The spelling of 23020012021 in words is "twenty-three billion, twenty million, twelve thousand, twenty-one".