21142311135061 has 2 divisors, whose sum is σ = 21142311135062. Its totient is φ = 21142311135060.

The previous prime is 21142311135059. The next prime is 21142311135139. The reversal of 21142311135061 is 16053111324112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20104408634436 + 1037902500625 = 4483794^2 + 1018775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142311135061 - 2¹ = 21142311135059 is a prime.

Together with 21142311135059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142311135031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571155567530 + 10571155567531.

It is an arithmetic number, because the mean of its divisors is an integer number (10571155567531).

Almost surely, 2^{21142311135061} is an apocalyptic number.

It is an amenable number.

21142311135061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142311135061 is an equidigital number, since it uses as much as digits as its factorization.

21142311135061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 21142311135061 its reverse (16053111324112), we get a palindrome (37195422459173).

The spelling of 21142311135061 in words is "twenty-one trillion, one hundred forty-two billion, three hundred eleven million, one hundred thirty-five thousand, sixty-one".