21100021102 has 8 divisors (see below), whose sum is σ = 32671000512. Its totient is φ = 10209687600.

The previous prime is 21100021091. The next prime is 21100021109. The reversal of 21100021102 is 20112000112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100021109) 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, 170161399 + ... + 170161522.

It is an arithmetic number, because the mean of its divisors is an integer number (4083875064).

Almost surely, 2^21100021102 is an apocalyptic number.

21100021102 is a deficient number, since it is larger than the sum of its proper divisors (11570979410).

21100021102 is a wasteful number, since it uses less digits than its factorization.

21100021102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340322954.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100021102 its reverse (20112000112), we get a palindrome (41212021214).

The spelling of 21100021102 in words is "twenty-one billion, one hundred million, twenty-one thousand, one hundred two".