21021212121202 has 8 divisors (see below), whose sum is σ = 32202707930496. Its totient is φ = 10286976144372.

The previous prime is 21021212121199. The next prime is 21021212121209. The reversal of 21021212121202 is 20212121212012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21021212121202.

It is not an unprimeable number, because it can be changed into a prime (21021212121209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111814957998 + ... + 111814958185.

It is an arithmetic number, because the mean of its divisors is an integer number (4025338491312).

Almost surely, 2^{21021212121202} is an apocalyptic number.

21021212121202 is a deficient number, since it is larger than the sum of its proper divisors (11181495809294).

21021212121202 is a wasteful number, since it uses less digits than its factorization.

21021212121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223629916232.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021212121202 its reverse (20212121212012), we get a palindrome (41233333333214).

The spelling of 21021212121202 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred two".