20303213021 has 32 divisors (see below), whose sum is σ = 26599507200. Its totient is φ = 15047493120.

The previous prime is 20303213003. The next prime is 20303213041. The reversal of 20303213021 is 12031230302.

It is a cyclic number.

It is not a de Polignac number, because 20303213021 - 2⁶ = 20303212957 is a prime.

It is a super-2 number, since 2×20303213021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303213041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87911 + ... + 219851.

It is an arithmetic number, because the mean of its divisors is an integer number (831234600).

Almost surely, 2^20303213021 is an apocalyptic number.

It is an amenable number.

20303213021 is a deficient number, since it is larger than the sum of its proper divisors (6296294179).

20303213021 is a wasteful number, since it uses less digits than its factorization.

20303213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132069.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20303213021 its reverse (12031230302), we get a palindrome (32334443323).

The spelling of 20303213021 in words is "twenty billion, three hundred three million, two hundred thirteen thousand, twenty-one".