21793141 has 2 divisors, whose sum is σ = 21793142. Its totient is φ = 21793140.

The previous prime is 21793139. The next prime is 21793151. The reversal of 21793141 is 14139712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14092516 + 7700625 = 3754^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21793141 - 2¹ = 21793139 is a prime.

Together with 21793139, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21793151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10896570 + 10896571.

It is an arithmetic number, because the mean of its divisors is an integer number (10896571).

Almost surely, 2^21793141 is an apocalyptic number.

21793141 is the 2953-rd centered pentagonal number.

It is an amenable number.

21793141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21793141 is an equidigital number, since it uses as much as digits as its factorization.

21793141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 21793141 is about 4668.3124359880. The cubic root of 21793141 is about 279.3229432374.

The spelling of 21793141 in words is "twenty-one million, seven hundred ninety-three thousand, one hundred forty-one".