20210021131 has 2 divisors, whose sum is σ = 20210021132. Its totient is φ = 20210021130.

The previous prime is 20210021059. The next prime is 20210021171. The reversal of 20210021131 is 13112001202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20210021131 - 2¹¹ = 20210019083 is a prime.

It is a super-2 number, since 2×20210021131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20210021171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105010565 + 10105010566.

It is an arithmetic number, because the mean of its divisors is an integer number (10105010566).

Almost surely, 2^20210021131 is an apocalyptic number.

20210021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210021131 is an equidigital number, since it uses as much as digits as its factorization.

20210021131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20210021131 its reverse (13112001202), we get a palindrome (33322022333).

The spelling of 20210021131 in words is "twenty billion, two hundred ten million, twenty-one thousand, one hundred thirty-one".