21859141 has 2 divisors, whose sum is σ = 21859142. Its totient is φ = 21859140.

The previous prime is 21859133. The next prime is 21859147. The reversal of 21859141 is 14195812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15634116 + 6225025 = 3954^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 21859141 - 2³ = 21859133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21859147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10929570 + 10929571.

It is an arithmetic number, because the mean of its divisors is an integer number (10929571).

Almost surely, 2^21859141 is an apocalyptic number.

It is an amenable number.

21859141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21859141 is an equidigital number, since it uses as much as digits as its factorization.

21859141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 21859141 is about 4675.3760276581. The cubic root of 21859141 is about 279.6046333221.

The spelling of 21859141 in words is "twenty-one million, eight hundred fifty-nine thousand, one hundred forty-one".