20334002021 has 4 divisors (see below), whose sum is σ = 20351133792. Its totient is φ = 20316870252.

The previous prime is 20334002009. The next prime is 20334002023. The reversal of 20334002021 is 12020043302.

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 20334002021 - 2²² = 20329807717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20334002023) 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, 8564105 + ... + 8566478.

It is an arithmetic number, because the mean of its divisors is an integer number (5087783448).

Almost surely, 2^20334002021 is an apocalyptic number.

It is an amenable number.

20334002021 is a deficient number, since it is larger than the sum of its proper divisors (17131771).

20334002021 is a wasteful number, since it uses less digits than its factorization.

20334002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17131770.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20334002021 its reverse (12020043302), we get a palindrome (32354045323).

The spelling of 20334002021 in words is "twenty billion, three hundred thirty-four million, two thousand, twenty-one".