21211212122202 has 16 divisors (see below), whose sum is σ = 42543978472800. Its totient is φ = 7050145002672.

The previous prime is 21211212122189. The next prime is 21211212122257. The reversal of 21211212122202 is 20222121211212.

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, 5064757248 + ... + 5064761435.

It is an arithmetic number, because the mean of its divisors is an integer number (2658998654550).

Almost surely, 2^{21211212122202} is an apocalyptic number.

21211212122202 is an abundant number, since it is smaller than the sum of its proper divisors (21332766350598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211212122202 is a wasteful number, since it uses less digits than its factorization.

21211212122202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10129519037.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21211212122202 its reverse (20222121211212), we get a palindrome (41433333333414).

The spelling of 21211212122202 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, two hundred two".