21220202120122 has 16 divisors (see below), whose sum is σ = 31971357567072. Its totient is φ = 10563186839920.

The previous prime is 21220202120099. The next prime is 21220202120137. The reversal of 21220202120122 is 22102120202212.

It is a self number, because there is not a number n which added to its sum of digits gives 21220202120122.

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, 25568308 + ... + 26385199.

It is an arithmetic number, because the mean of its divisors is an integer number (1998209847942).

Almost surely, 2^{21220202120122} is an apocalyptic number.

21220202120122 is a deficient number, since it is larger than the sum of its proper divisors (10751155446950).

21220202120122 is a wasteful number, since it uses less digits than its factorization.

21220202120122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51954413.

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

Adding to 21220202120122 its reverse (22102120202212), we get a palindrome (43322322322334).

The spelling of 21220202120122 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred twenty thousand, one hundred twenty-two".