21020020211222 has 4 divisors (see below), whose sum is σ = 31530030316836. Its totient is φ = 10510010105610.

The previous prime is 21020020211171. The next prime is 21020020211243. The reversal of 21020020211222 is 22211202002012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21020020211222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255005052804 + ... + 5255005052807.

It is an arithmetic number, because the mean of its divisors is an integer number (7882507579209).

Almost surely, 2^{21020020211222} is an apocalyptic number.

21020020211222 is a deficient number, since it is larger than the sum of its proper divisors (10510010105614).

21020020211222 is a wasteful number, since it uses less digits than its factorization.

21020020211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510010105613.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21020020211222 its reverse (22211202002012), we get a palindrome (43231222213234).

The spelling of 21020020211222 in words is "twenty-one trillion, twenty billion, twenty million, two hundred eleven thousand, two hundred twenty-two".