21221111020222 has 4 divisors (see below), whose sum is σ = 31831666530336. Its totient is φ = 10610555510110.

The previous prime is 21221111020169. The next prime is 21221111020223. The reversal of 21221111020222 is 22202011112212.

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

It is a super-2 number, since 2×21221111020222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221111020222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221111020223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305277755054 + ... + 5305277755057.

It is an arithmetic number, because the mean of its divisors is an integer number (7957916632584).

Almost surely, 2^{21221111020222} is an apocalyptic number.

21221111020222 is a deficient number, since it is larger than the sum of its proper divisors (10610555510114).

21221111020222 is a wasteful number, since it uses less digits than its factorization.

21221111020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610555510113.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221111020222 its reverse (22202011112212), we get a palindrome (43423122132434).

The spelling of 21221111020222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twenty thousand, two hundred twenty-two".