21747113 has 2 divisors, whose sum is σ = 21747114. Its totient is φ = 21747112.

The previous prime is 21747107. The next prime is 21747127. The reversal of 21747113 is 31174712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21187609 + 559504 = 4603^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 21747113 - 2²² = 17552809 is a prime.

It is not a weakly prime, because it can be changed into another prime (21747133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873556 + 10873557.

It is an arithmetic number, because the mean of its divisors is an integer number (10873557).

Almost surely, 2^21747113 is an apocalyptic number.

It is an amenable number.

21747113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21747113 is an equidigital number, since it uses as much as digits as its factorization.

21747113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 21747113 is about 4663.3799973839. The cubic root of 21747113 is about 279.1261574943.

The spelling of 21747113 in words is "twenty-one million, seven hundred forty-seven thousand, one hundred thirteen".