20201121431 has 2 divisors, whose sum is σ = 20201121432. Its totient is φ = 20201121430.

The previous prime is 20201121419. The next prime is 20201121463. The reversal of 20201121431 is 13412110202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201121431 - 2¹⁴ = 20201105047 is a prime.

It is a super-2 number, since 2×20201121431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201121481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100560715 + 10100560716.

It is an arithmetic number, because the mean of its divisors is an integer number (10100560716).

Almost surely, 2^20201121431 is an apocalyptic number.

20201121431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201121431 is an equidigital number, since it uses as much as digits as its factorization.

20201121431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20201121431 its reverse (13412110202), we get a palindrome (33613231633).

The spelling of 20201121431 in words is "twenty billion, two hundred one million, one hundred twenty-one thousand, four hundred thirty-one".