21474143 has 2 divisors, whose sum is σ = 21474144. Its totient is φ = 21474142.

The previous prime is 21474139. The next prime is 21474217. The reversal of 21474143 is 34147412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21474143 - 2² = 21474139 is a prime.

It is a super-2 number, since 2×21474143² = 922277635168898, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21474113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10737071 + 10737072.

It is an arithmetic number, because the mean of its divisors is an integer number (10737072).

Almost surely, 2^21474143 is an apocalyptic number.

21474143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21474143 is an equidigital number, since it uses as much as digits as its factorization.

21474143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 21474143 is about 4634.0201769090. The cubic root of 21474143 is about 277.9533719219.

The spelling of 21474143 in words is "twenty-one million, four hundred seventy-four thousand, one hundred forty-three".