21202220121222 has 16 divisors (see below), whose sum is σ = 48462217420032. Its totient is φ = 6057777177480.

The previous prime is 21202220121209. The next prime is 21202220121241. The reversal of 21202220121222 is 22212102220212.

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, 252407382354 + ... + 252407382437.

It is an arithmetic number, because the mean of its divisors is an integer number (3028888588752).

Almost surely, 2^{21202220121222} is an apocalyptic number.

21202220121222 is an abundant number, since it is smaller than the sum of its proper divisors (27259997298810).

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

21202220121222 is a wasteful number, since it uses less digits than its factorization.

21202220121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504814764803.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21202220121222 its reverse (22212102220212), we get a palindrome (43414322341434).

The spelling of 21202220121222 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-two".