21022001221222 has 4 divisors (see below), whose sum is σ = 31533001831836. Its totient is φ = 10511000610610.

The previous prime is 21022001221211. The next prime is 21022001221259. The reversal of 21022001221222 is 22212210022012.

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 21022001221222.

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, 5255500305304 + ... + 5255500305307.

It is an arithmetic number, because the mean of its divisors is an integer number (7883250457959).

Almost surely, 2^{21022001221222} is an apocalyptic number.

21022001221222 is a deficient number, since it is larger than the sum of its proper divisors (10511000610614).

21022001221222 is a wasteful number, since it uses less digits than its factorization.

21022001221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511000610613.

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

Adding to 21022001221222 its reverse (22212210022012), we get a palindrome (43234211243234).

The spelling of 21022001221222 in words is "twenty-one trillion, twenty-two billion, one million, two hundred twenty-one thousand, two hundred twenty-two".