21220233943 has 2 divisors, whose sum is σ = 21220233944. Its totient is φ = 21220233942.

The previous prime is 21220233911. The next prime is 21220233949. The reversal of 21220233943 is 34933202212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220233943 - 2⁵ = 21220233911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220233949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610116971 + 10610116972.

It is an arithmetic number, because the mean of its divisors is an integer number (10610116972).

Almost surely, 2^21220233943 is an apocalyptic number.

21220233943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220233943 is an equidigital number, since it uses as much as digits as its factorization.

21220233943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The spelling of 21220233943 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-three thousand, nine hundred forty-three".