21381458141 has 2 divisors, whose sum is σ = 21381458142. Its totient is φ = 21381458140.

The previous prime is 21381458117. The next prime is 21381458201. The reversal of 21381458141 is 14185418312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13941705625 + 7439752516 = 118075^2 + 86254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21381458141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21381458095 and 21381458104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21381458041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10690729070 + 10690729071.

It is an arithmetic number, because the mean of its divisors is an integer number (10690729071).

Almost surely, 2^21381458141 is an apocalyptic number.

It is an amenable number.

21381458141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21381458141 is an equidigital number, since it uses as much as digits as its factorization.

21381458141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 38.

The spelling of 21381458141 in words is "twenty-one billion, three hundred eighty-one million, four hundred fifty-eight thousand, one hundred forty-one".