21210122211222 has 16 divisors (see below), whose sum is σ = 48480279340032. Its totient is φ = 6060034917480.

The previous prime is 21210122211211. The next prime is 21210122211241. The reversal of 21210122211222 is 22211222101212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 252501454854 + ... + 252501454937.

It is an arithmetic number, because the mean of its divisors is an integer number (3030017458752).

Almost surely, 2^{21210122211222} is an apocalyptic number.

21210122211222 is an abundant number, since it is smaller than the sum of its proper divisors (27270157128810).

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

21210122211222 is a wasteful number, since it uses less digits than its factorization.

21210122211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505002909803.

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

Adding to 21210122211222 its reverse (22211222101212), we get a palindrome (43421344312434).

The spelling of 21210122211222 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-two".