21221010122222 has 8 divisors (see below), whose sum is σ = 31834241219496. Its totient is φ = 10609596382392.

The previous prime is 21221010122183. The next prime is 21221010122233. The reversal of 21221010122222 is 22222101012212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21221010122194 and 21221010122203.

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, 454310168 + ... + 454356875.

It is an arithmetic number, because the mean of its divisors is an integer number (3979280152437).

Almost surely, 2^{21221010122222} is an apocalyptic number.

21221010122222 is a deficient number, since it is larger than the sum of its proper divisors (10613231097274).

21221010122222 is a wasteful number, since it uses less digits than its factorization.

21221010122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908678722.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221010122222 its reverse (22222101012212), we get a palindrome (43443111134434).

The spelling of 21221010122222 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, one hundred twenty-two thousand, two hundred twenty-two".