21629327 has 2 divisors, whose sum is σ = 21629328. Its totient is φ = 21629326.

The previous prime is 21629303. The next prime is 21629329. The reversal of 21629327 is 72392612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21629327 - 2¹² = 21625231 is a prime.

Together with 21629329, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21629293 and 21629302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21629329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10814663 + 10814664.

It is an arithmetic number, because the mean of its divisors is an integer number (10814664).

Almost surely, 2^21629327 is an apocalyptic number.

21629327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21629327 is an equidigital number, since it uses as much as digits as its factorization.

21629327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 21629327 is about 4650.7340280863. The cubic root of 21629327 is about 278.6213136423.

The spelling of 21629327 in words is "twenty-one million, six hundred twenty-nine thousand, three hundred twenty-seven".