21210202220122 has 16 divisors (see below), whose sum is σ = 33489882770400. Its totient is φ = 10046910956400.

The previous prime is 21210202220117. The next prime is 21210202220131. The reversal of 21210202220122 is 22102220201212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21210202220122.

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, 26458497 + ... + 27248347.

It is an arithmetic number, because the mean of its divisors is an integer number (2093117673150).

Almost surely, 2^{21210202220122} is an apocalyptic number.

21210202220122 is a deficient number, since it is larger than the sum of its proper divisors (12279680550278).

21210202220122 is a wasteful number, since it uses less digits than its factorization.

21210202220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496541.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21210202220122 its reverse (22102220201212), we get a palindrome (43312422421334).

The spelling of 21210202220122 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, two hundred twenty thousand, one hundred twenty-two".