21221220212222 has 8 divisors (see below), whose sum is σ = 31832187489000. Its totient is φ = 10610491049224.

The previous prime is 21221220212189. The next prime is 21221220212249. The reversal of 21221220212222 is 22221202212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59305472 + ... + 59662227.

It is an arithmetic number, because the mean of its divisors is an integer number (3979023436125).

Almost surely, 2^{21221220212222} is an apocalyptic number.

21221220212222 is a deficient number, since it is larger than the sum of its proper divisors (10610967276778).

21221220212222 is a wasteful number, since it uses less digits than its factorization.

21221220212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119056890.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21221220212222 its reverse (22221202212212), we get a palindrome (43442422424434).

The spelling of 21221220212222 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-two".