21211020202 has 8 divisors (see below), whose sum is σ = 31858898112. Its totient is φ = 10591387500.

The previous prime is 21211020191. The next prime is 21211020269. The reversal of 21211020202 is 20202011212.

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, 7059424 + ... + 7062427.

It is an arithmetic number, because the mean of its divisors is an integer number (3982362264).

Almost surely, 2^21211020202 is an apocalyptic number.

21211020202 is a deficient number, since it is larger than the sum of its proper divisors (10647877910).

21211020202 is a wasteful number, since it uses less digits than its factorization.

21211020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14122604.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21211020202 its reverse (20202011212), we get a palindrome (41413031414).

The spelling of 21211020202 in words is "twenty-one billion, two hundred eleven million, twenty thousand, two hundred two".