21100082 has 8 divisors (see below), whose sum is σ = 31710252. Its totient is φ = 10530000.

The previous prime is 21100069. The next prime is 21100087. The reversal of 21100082 is 28000112.

It can be written as a sum of positive squares in 2 ways, for example, as 21077281 + 22801 = 4591^2 + 151^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21100087) 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, 8669 + ... + 10832.

Almost surely, 2^21100082 is an apocalyptic number.

21100082 is a deficient number, since it is larger than the sum of its proper divisors (10610170).

21100082 is a wasteful number, since it uses less digits than its factorization.

21100082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20044.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21100082 is about 4593.4825568407. The cubic root of 21100082 is about 276.3300067876.

Adding to 21100082 its reverse (28000112), we get a palindrome (49100194).

The spelling of 21100082 in words is "twenty-one million, one hundred thousand, eighty-two".