21234793 has 2 divisors, whose sum is σ = 21234794. Its totient is φ = 21234792.

The previous prime is 21234767. The next prime is 21234797. The reversal of 21234793 is 39743212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 514089 = 4552^2 + 717^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234793 - 2⁹ = 21234281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617396 + 10617397.

It is an arithmetic number, because the mean of its divisors is an integer number (10617397).

Almost surely, 2^21234793 is an apocalyptic number.

It is an amenable number.

21234793 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234793 is an equidigital number, since it uses as much as digits as its factorization.

21234793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 21234793 is about 4608.1225027119. The cubic root of 21234793 is about 276.9168252407.

The spelling of 21234793 in words is "twenty-one million, two hundred thirty-four thousand, seven hundred ninety-three".