21103522 has 16 divisors (see below), whose sum is σ = 34667712. Its totient is φ = 9555120.

The previous prime is 21103519. The next prime is 21103531. The reversal of 21103522 is 22530112.

It is a junction number, because it is equal to n+sod(n) for n = 21103496 and 21103505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4363 + ... + 7825.

It is an arithmetic number, because the mean of its divisors is an integer number (2166732).

Almost surely, 2^21103522 is an apocalyptic number.

21103522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21103522 is a deficient number, since it is larger than the sum of its proper divisors (13564190).

21103522 is a wasteful number, since it uses less digits than its factorization.

21103522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21103522 is about 4593.8569851488. The cubic root of 21103522 is about 276.3450228994.

Adding to 21103522 its reverse (22530112), we get a palindrome (43633634).

The spelling of 21103522 in words is "twenty-one million, one hundred three thousand, five hundred twenty-two".