21010220102 has 16 divisors (see below), whose sum is σ = 33178306560. Its totient is φ = 9950927112.

The previous prime is 21010220089. The next prime is 21010220129. The reversal of 21010220102 is 20102201012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305603 + ... + 367985.

It is an arithmetic number, because the mean of its divisors is an integer number (2073644160).

Almost surely, 2^21010220102 is an apocalyptic number.

21010220102 is a deficient number, since it is larger than the sum of its proper divisors (12168086458).

21010220102 is a wasteful number, since it uses less digits than its factorization.

21010220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71267.

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

Adding to 21010220102 its reverse (20102201012), we get a palindrome (41112421114).

The spelling of 21010220102 in words is "twenty-one billion, ten million, two hundred twenty thousand, one hundred two".