21522104 has 8 divisors (see below), whose sum is σ = 40353960. Its totient is φ = 10761048.

The previous prime is 21522103. The next prime is 21522131. The reversal of 21522104 is 40122512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522101) 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, 1345124 + ... + 1345139.

It is an arithmetic number, because the mean of its divisors is an integer number (5044245).

Almost surely, 2^21522104 is an apocalyptic number.

It is an amenable number.

21522104 is a deficient number, since it is larger than the sum of its proper divisors (18831856).

21522104 is a wasteful number, since it uses less digits than its factorization.

21522104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690269 (or 2690265 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21522104 is about 4639.1921710574. The cubic root of 21522104 is about 278.1601478789.

Adding to 21522104 its reverse (40122512), we get a palindrome (61644616).

The spelling of 21522104 in words is "twenty-one million, five hundred twenty-two thousand, one hundred four".