21673277 has 2 divisors, whose sum is σ = 21673278. Its totient is φ = 21673276.

The previous prime is 21673271. The next prime is 21673303. The reversal of 21673277 is 77237612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 2785561 = 4346^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 21673277 - 2⁴ = 21673261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21673271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10836638 + 10836639.

It is an arithmetic number, because the mean of its divisors is an integer number (10836639).

Almost surely, 2^21673277 is an apocalyptic number.

It is an amenable number.

21673277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21673277 is an equidigital number, since it uses as much as digits as its factorization.

21673277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 35.

The square root of 21673277 is about 4655.4566908092. The cubic root of 21673277 is about 278.8099020654.

The spelling of 21673277 in words is "twenty-one million, six hundred seventy-three thousand, two hundred seventy-seven".