21101020202 has 8 divisors (see below), whose sum is σ = 31674688416. Its totient is φ = 10542790732.

The previous prime is 21101020181. The next prime is 21101020229. The reversal of 21101020202 is 20202010112.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3856268 + ... + 3861735.

It is an arithmetic number, because the mean of its divisors is an integer number (3959336052).

Almost surely, 2^21101020202 is an apocalyptic number.

21101020202 is a deficient number, since it is larger than the sum of its proper divisors (10573668214).

21101020202 is a wasteful number, since it uses less digits than its factorization.

21101020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7719372.

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

Adding to 21101020202 its reverse (20202010112), we get a palindrome (41303030314).

The spelling of 21101020202 in words is "twenty-one billion, one hundred one million, twenty thousand, two hundred two".