21158388125141 has 2 divisors, whose sum is σ = 21158388125142. Its totient is φ = 21158388125140.

The previous prime is 21158388125123. The next prime is 21158388125219. The reversal of 21158388125141 is 14152188385112.

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., 18563215335025 + 2595172790116 = 4308505^2 + 1610954^2 .

It is a cyclic number.

It is not a de Polignac number, because 21158388125141 - 2³⁴ = 21141208255957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21158388125141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21158388122141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10579194062570 + 10579194062571.

It is an arithmetic number, because the mean of its divisors is an integer number (10579194062571).

Almost surely, 2^{21158388125141} is an apocalyptic number.

It is an amenable number.

21158388125141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21158388125141 is an equidigital number, since it uses as much as digits as its factorization.

21158388125141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 614400, while the sum is 50.

The spelling of 21158388125141 in words is "twenty-one trillion, one hundred fifty-eight billion, three hundred eighty-eight million, one hundred twenty-five thousand, one hundred forty-one".