21932143 has 2 divisors, whose sum is σ = 21932144. Its totient is φ = 21932142.

The previous prime is 21932077. The next prime is 21932147. The reversal of 21932143 is 34123912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21932143 - 2⁹ = 21931631 is a prime.

It is equal to p_1385224 and since 21932143 and 1385224 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21932147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966071 + 10966072.

It is an arithmetic number, because the mean of its divisors is an integer number (10966072).

Almost surely, 2^21932143 is an apocalyptic number.

21932143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21932143 is an equidigital number, since it uses as much as digits as its factorization.

21932143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 21932143 is about 4683.1765928694. The cubic root of 21932143 is about 279.9155485105.

The spelling of 21932143 in words is "twenty-one million, nine hundred thirty-two thousand, one hundred forty-three".