21002023041 has 4 divisors (see below), whose sum is σ = 28002697392. Its totient is φ = 14001348692.

The previous prime is 21002023013. The next prime is 21002023061. The reversal of 21002023041 is 14032020012.

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 21002023041 - 2²³ = 20993634433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002023041.

It is not an unprimeable number, because it can be changed into a prime (21002023001) 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, 3500337171 + ... + 3500337176.

It is an arithmetic number, because the mean of its divisors is an integer number (7000674348).

Almost surely, 2^21002023041 is an apocalyptic number.

It is an amenable number.

21002023041 is a deficient number, since it is larger than the sum of its proper divisors (7000674351).

21002023041 is an equidigital number, since it uses as much as digits as its factorization.

21002023041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000674350.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002023041 its reverse (14032020012), we get a palindrome (35034043053).

The spelling of 21002023041 in words is "twenty-one billion, two million, twenty-three thousand, forty-one".