20431021222143 has 40 divisors (see below), whose sum is σ = 34881010131968. Its totient is φ = 11674689694416.

The previous prime is 20431021222111. The next prime is 20431021222153. The reversal of 20431021222143 is 34122212013402.

20431021222143 is a `hidden beast` number, since 2 + 0 + 431 + 0 + 2 + 1 + 2 + 221 + 4 + 3 = 666.

It is not a de Polignac number, because 20431021222143 - 2⁵ = 20431021222111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431021222153) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42411930 + ... + 42890952.

Almost surely, 2^{20431021222143} is an apocalyptic number.

20431021222143 is a deficient number, since it is larger than the sum of its proper divisors (14449988909825).

20431021222143 is an equidigital number, since it uses as much as digits as its factorization.

20431021222143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554265 (or 554256 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 20431021222143 its reverse (34122212013402), we get a palindrome (54553233235545).

The spelling of 20431021222143 in words is "twenty trillion, four hundred thirty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred forty-three".