21575106 has 32 divisors (see below), whose sum is σ = 54794880. Its totient is φ = 6164208.

The previous prime is 21575083. The next prime is 21575117. The reversal of 21575106 is 60157512.

It is a super-2 number, since 2×21575106² = 930970397822472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21575106.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 28161 + ... + 28916.

It is an arithmetic number, because the mean of its divisors is an integer number (1712340).

Almost surely, 2^21575106 is an apocalyptic number.

21575106 is an abundant number, since it is smaller than the sum of its proper divisors (33219774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21575106 is a wasteful number, since it uses less digits than its factorization.

21575106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57095 (or 57089 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 21575106 is about 4644.9010753729. The cubic root of 21575106 is about 278.3883002664.

The spelling of 21575106 in words is "twenty-one million, five hundred seventy-five thousand, one hundred six".