20402301021 has 4 divisors (see below), whose sum is σ = 27203068032. Its totient is φ = 13601534012.

The previous prime is 20402301019. The next prime is 20402301043. The reversal of 20402301021 is 12010320402.

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 20402301021 - 2¹ = 20402301019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402301721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400383501 + ... + 3400383506.

It is an arithmetic number, because the mean of its divisors is an integer number (6800767008).

Almost surely, 2^20402301021 is an apocalyptic number.

It is an amenable number.

20402301021 is a deficient number, since it is larger than the sum of its proper divisors (6800767011).

20402301021 is an equidigital number, since it uses as much as digits as its factorization.

20402301021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6800767010.

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

Adding to 20402301021 its reverse (12010320402), we get a palindrome (32412621423).

The spelling of 20402301021 in words is "twenty billion, four hundred two million, three hundred one thousand, twenty-one".