21210221121202 has 16 divisors (see below), whose sum is σ = 31974576530400. Its totient is φ = 10552055552640.

The previous prime is 21210221121191. The next prime is 21210221121209. The reversal of 21210221121202 is 20212112201212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210221121202.

It is not an unprimeable number, because it can be changed into a prime (21210221121209) 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, 5055327 + ... + 8244802.

It is an arithmetic number, because the mean of its divisors is an integer number (1998411033150).

Almost surely, 2^{21210221121202} is an apocalyptic number.

21210221121202 is a deficient number, since it is larger than the sum of its proper divisors (10764355409198).

21210221121202 is a wasteful number, since it uses less digits than its factorization.

21210221121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13304121.

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

Adding to 21210221121202 its reverse (20212112201212), we get a palindrome (41422333322414).

The spelling of 21210221121202 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred two".