21100220102 has 16 divisors (see below), whose sum is σ = 35566927200. Its totient is φ = 9315147072.

The previous prime is 21100220101. The next prime is 21100220111. The reversal of 21100220102 is 20102200112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100220101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17641727 + ... + 17642922.

It is an arithmetic number, because the mean of its divisors is an integer number (2222932950).

Almost surely, 2^21100220102 is an apocalyptic number.

21100220102 is a deficient number, since it is larger than the sum of its proper divisors (14466707098).

21100220102 is a wasteful number, since it uses less digits than its factorization.

21100220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35284687.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100220102 its reverse (20102200112), we get a palindrome (41202420214).

The spelling of 21100220102 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, one hundred two".