21220121020222 has 4 divisors (see below), whose sum is σ = 31830181530336. Its totient is φ = 10610060510110.

The previous prime is 21220121020211. The next prime is 21220121020277. The reversal of 21220121020222 is 22202012102212.

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

It is a super-2 number, since 2×21220121020222² (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 21220121020222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305030255054 + ... + 5305030255057.

It is an arithmetic number, because the mean of its divisors is an integer number (7957545382584).

Almost surely, 2^{21220121020222} is an apocalyptic number.

21220121020222 is a deficient number, since it is larger than the sum of its proper divisors (10610060510114).

21220121020222 is a wasteful number, since it uses less digits than its factorization.

21220121020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610060510113.

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

Adding to 21220121020222 its reverse (22202012102212), we get a palindrome (43422133122434).

The spelling of 21220121020222 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty thousand, two hundred twenty-two".