21476671 has 2 divisors, whose sum is σ = 21476672. Its totient is φ = 21476670.

The previous prime is 21476659. The next prime is 21476699. The reversal of 21476671 is 17667412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21476671 - 2⁵ = 21476639 is a prime.

It is a super-2 number, since 2×21476671² = 922494794484482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21476621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738335 + 10738336.

It is an arithmetic number, because the mean of its divisors is an integer number (10738336).

Almost surely, 2^21476671 is an apocalyptic number.

21476671 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476671 is an equidigital number, since it uses as much as digits as its factorization.

21476671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 21476671 is about 4634.2929342026. The cubic root of 21476671 is about 277.9642786599.

It can be divided in two parts, 21476 and 671, that multiplied together give a triangular number (14410396 = T₅₃₆₈).

The spelling of 21476671 in words is "twenty-one million, four hundred seventy-six thousand, six hundred seventy-one".