20012021131 has 2 divisors, whose sum is σ = 20012021132. Its totient is φ = 20012021130.

The previous prime is 20012021129. The next prime is 20012021137. The reversal of 20012021131 is 13112021002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012021131 - 2¹ = 20012021129 is a prime.

It is a super-2 number, since 2×20012021131² (a number of 21 digits) contains 22 as substring.

Together with 20012021129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20012021137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006010565 + 10006010566.

It is an arithmetic number, because the mean of its divisors is an integer number (10006010566).

Almost surely, 2^20012021131 is an apocalyptic number.

20012021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012021131 is an equidigital number, since it uses as much as digits as its factorization.

20012021131 is an evil number, because the sum of its binary digits is even.

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

Adding to 20012021131 its reverse (13112021002), we get a palindrome (33124042133).

The spelling of 20012021131 in words is "twenty billion, twelve million, twenty-one thousand, one hundred thirty-one".