21106030 has 24 divisors (see below), whose sum is σ = 41760936. Its totient is φ = 7674480.

The previous prime is 21105977. The next prime is 21106037. The reversal of 21106030 is 3060112.

It is a self number, because there is not a number n which added to its sum of digits gives 21106030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106037) 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 in 11 ways as a sum of consecutive naturals, for example, 7512 + ... + 9931.

It is an arithmetic number, because the mean of its divisors is an integer number (1740039).

Almost surely, 2^21106030 is an apocalyptic number.

21106030 is a deficient number, since it is larger than the sum of its proper divisors (20654906).

21106030 is a wasteful number, since it uses less digits than its factorization.

21106030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17472 (or 17461 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21106030 is about 4594.1299502735. The cubic root of 21106030 is about 276.3559696640.

Adding to 21106030 its reverse (3060112), we get a palindrome (24166142).

The spelling of 21106030 in words is "twenty-one million, one hundred six thousand, thirty".