20210021331 has 4 divisors (see below), whose sum is σ = 26946695112. Its totient is φ = 13473347552.

The previous prime is 20210021329. The next prime is 20210021333. The reversal of 20210021331 is 13312001202.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20210021329) and next prime (20210021333).

It is a cyclic number.

It is not a de Polignac number, because 20210021331 - 2¹ = 20210021329 is a prime.

It is a super-2 number, since 2×20210021331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20210021331.

It is not an unprimeable number, because it can be changed into a prime (20210021333) 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 3 ways as a sum of consecutive naturals, for example, 3368336886 + ... + 3368336891.

It is an arithmetic number, because the mean of its divisors is an integer number (6736673778).

Almost surely, 2^20210021331 is an apocalyptic number.

20210021331 is a deficient number, since it is larger than the sum of its proper divisors (6736673781).

20210021331 is an equidigital number, since it uses as much as digits as its factorization.

20210021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736673780.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20210021331 its reverse (13312001202), we get a palindrome (33522022533).

The spelling of 20210021331 in words is "twenty billion, two hundred ten million, twenty-one thousand, three hundred thirty-one".