21416023 has 2 divisors, whose sum is σ = 21416024. Its totient is φ = 21416022.

The previous prime is 21415991. The next prime is 21416029. The reversal of 21416023 is 32061412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21416023 - 2⁵ = 21415991 is a prime.

It is a super-2 number, since 2×21416023² = 917292082273058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21416029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708011 + 10708012.

It is an arithmetic number, because the mean of its divisors is an integer number (10708012).

Almost surely, 2^21416023 is an apocalyptic number.

21416023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416023 is an equidigital number, since it uses as much as digits as its factorization.

21416023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21416023 is about 4627.7449151828. The cubic root of 21416023 is about 277.7023840839.

Adding to 21416023 its reverse (32061412), we get a palindrome (53477435).

The spelling of 21416023 in words is "twenty-one million, four hundred sixteen thousand, twenty-three".