21211210202 has 16 divisors (see below), whose sum is σ = 39159157632. Its totient is φ = 8391247920.

The previous prime is 21211210201. The next prime is 21211210211. The reversal of 21211210202 is 20201211212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21211210201) 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, 58272374 + ... + 58272737.

It is an arithmetic number, because the mean of its divisors is an integer number (2447447352).

Almost surely, 2^21211210202 is an apocalyptic number.

21211210202 is a deficient number, since it is larger than the sum of its proper divisors (17947947430).

21211210202 is a wasteful number, since it uses less digits than its factorization.

21211210202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116545133.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21211210202 its reverse (20201211212), we get a palindrome (41412421414).

The spelling of 21211210202 in words is "twenty-one billion, two hundred eleven million, two hundred ten thousand, two hundred two".