21020232001 has 4 divisors (see below), whose sum is σ = 21020529600. Its totient is φ = 21019934404.

The previous prime is 21020231989. The next prime is 21020232011. The reversal of 21020232001 is 10023202012.

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 not a de Polignac number, because 21020232001 - 2¹⁷ = 21020100929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020232011) 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, 24180 + ... + 206458.

It is an arithmetic number, because the mean of its divisors is an integer number (5255132400).

Almost surely, 2^21020232001 is an apocalyptic number.

It is an amenable number.

21020232001 is a deficient number, since it is larger than the sum of its proper divisors (297599).

21020232001 is a wasteful number, since it uses less digits than its factorization.

21020232001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297598.

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

Adding to 21020232001 its reverse (10023202012), we get a palindrome (31043434013).

The spelling of 21020232001 in words is "twenty-one billion, twenty million, two hundred thirty-two thousand, one".