21222100022202 has 20 divisors (see below), whose sum is σ = 47553224124186. Its totient is φ = 7074033340680.

The previous prime is 21222100022147. The next prime is 21222100022219. The reversal of 21222100022202 is 20222000122212.

It can be written as a sum of positive squares in only one way, i.e., 19037435702481 + 2184664319721 = 4363191^2 + 1478061^2 .

It is a super-2 number, since 2×21222100022202² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65500308549 + ... + 65500308872.

Almost surely, 2^{21222100022202} is an apocalyptic number.

21222100022202 is an abundant number, since it is smaller than the sum of its proper divisors (26331124101984).

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

21222100022202 is a wasteful number, since it uses less digits than its factorization.

21222100022202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131000617435 (or 131000617426 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222100022202 its reverse (20222000122212), we get a palindrome (41444100144414).

The spelling of 21222100022202 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred million, twenty-two thousand, two hundred two".