21747104 has 12 divisors (see below), whose sum is σ = 42814674. Its totient is φ = 10873536.

The previous prime is 21747101. The next prime is 21747107. The reversal of 21747104 is 40174712.

It is an interprime number because it is at equal distance from previous prime (21747101) and next prime (21747107).

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 8410000 = 3652^2 + 2900^2 .

It is not an unprimeable number, because it can be changed into a prime (21747101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339767 + ... + 339830.

Almost surely, 2^21747104 is an apocalyptic number.

It is an amenable number.

21747104 is a deficient number, since it is larger than the sum of its proper divisors (21067570).

21747104 is an equidigital number, since it uses as much as digits as its factorization.

21747104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679607 (or 679599 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 21747104 is about 4663.3790324184. The cubic root of 21747104 is about 279.1261189890.

The spelling of 21747104 in words is "twenty-one million, seven hundred forty-seven thousand, one hundred four".