21100141 has 2 divisors, whose sum is σ = 21100142. Its totient is φ = 21100140.

The previous prime is 21100129. The next prime is 21100159. The reversal of 21100141 is 14100112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 32041 = 4590^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100141 - 2¹³ = 21091949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550070 + 10550071.

It is an arithmetic number, because the mean of its divisors is an integer number (10550071).

Almost surely, 2^21100141 is an apocalyptic number.

It is an amenable number.

21100141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100141 is an equidigital number, since it uses as much as digits as its factorization.

21100141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21100141 is about 4593.4889789788. The cubic root of 21100141 is about 276.3302643451.

Adding to 21100141 its reverse (14100112), we get a palindrome (35200253).

The spelling of 21100141 in words is "twenty-one million, one hundred thousand, one hundred forty-one".