20442141281 has 2 divisors, whose sum is σ = 20442141282. Its totient is φ = 20442141280.

The previous prime is 20442141257. The next prime is 20442141337. The reversal of 20442141281 is 18214124402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20431843600 + 10297681 = 142940^2 + 3209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442141281 is a prime.

It is a super-2 number, since 2×20442141281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20442141221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221070640 + 10221070641.

It is an arithmetic number, because the mean of its divisors is an integer number (10221070641).

Almost surely, 2^20442141281 is an apocalyptic number.

It is an amenable number.

20442141281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442141281 is an equidigital number, since it uses as much as digits as its factorization.

20442141281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 29.

Adding to 20442141281 its reverse (18214124402), we get a palindrome (38656265683).

The spelling of 20442141281 in words is "twenty billion, four hundred forty-two million, one hundred forty-one thousand, two hundred eighty-one".