21121201222222 has 8 divisors (see below), whose sum is σ = 31977893439576. Its totient is φ = 10461903409032.

The previous prime is 21121201222201. The next prime is 21121201222273. The reversal of 21121201222222 is 22222210212112.

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

It is a super-3 number, since 3×21121201222222³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21121201222193 and 21121201222202.

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, 49348600773 + ... + 49348601200.

It is an arithmetic number, because the mean of its divisors is an integer number (3997236679947).

Almost surely, 2^{21121201222222} is an apocalyptic number.

21121201222222 is a deficient number, since it is larger than the sum of its proper divisors (10856692217354).

21121201222222 is a wasteful number, since it uses less digits than its factorization.

21121201222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98697202082.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21121201222222 its reverse (22222210212112), we get a palindrome (43343411434334).

The spelling of 21121201222222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty-two thousand, two hundred twenty-two".