21497104 has 10 divisors (see below), whose sum is σ = 41650670. Its totient is φ = 10748544.

The previous prime is 21497101. The next prime is 21497123. The reversal of 21497104 is 40179412.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 8880400 = 3552^2 + 2980^2 .

It is not an unprimeable number, because it can be changed into a prime (21497101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671769 + ... + 671800.

It is an arithmetic number, because the mean of its divisors is an integer number (4165067).

Almost surely, 2^21497104 is an apocalyptic number.

It is an amenable number.

21497104 is a deficient number, since it is larger than the sum of its proper divisors (20153566).

21497104 is a wasteful number, since it uses less digits than its factorization.

21497104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343577 (or 1343571 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21497104 is about 4636.4969535200. The cubic root of 21497104 is about 278.0524028675.

The spelling of 21497104 in words is "twenty-one million, four hundred ninety-seven thousand, one hundred four".