20442142211 has 2 divisors, whose sum is σ = 20442142212. Its totient is φ = 20442142210.

The previous prime is 20442142187. The next prime is 20442142219. The reversal of 20442142211 is 11224124402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442142211 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442142219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221071105 + 10221071106.

It is an arithmetic number, because the mean of its divisors is an integer number (10221071106).

Almost surely, 2^20442142211 is an apocalyptic number.

20442142211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442142211 is an equidigital number, since it uses as much as digits as its factorization.

20442142211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20442142211 its reverse (11224124402), we get a palindrome (31666266613).

The spelling of 20442142211 in words is "twenty billion, four hundred forty-two million, one hundred forty-two thousand, two hundred eleven".