21100630 has 8 divisors (see below), whose sum is σ = 37981152. Its totient is φ = 8440248.

The previous prime is 21100613. The next prime is 21100631. The reversal of 21100630 is 3600112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21100630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055022 + ... + 1055041.

It is an arithmetic number, because the mean of its divisors is an integer number (4747644).

Almost surely, 2^21100630 is an apocalyptic number.

21100630 is a deficient number, since it is larger than the sum of its proper divisors (16880522).

21100630 is a wasteful number, since it uses less digits than its factorization.

21100630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110070.

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

The square root of 21100630 is about 4593.5422061847. The cubic root of 21100630 is about 276.3323989984.

Adding to 21100630 its reverse (3600112), we get a palindrome (24700742).

The spelling of 21100630 in words is "twenty-one million, one hundred thousand, six hundred thirty".