21120212121222 has 8 divisors (see below), whose sum is σ = 42240424242456. Its totient is φ = 7040070707072.

The previous prime is 21120212121193. The next prime is 21120212121233. The reversal of 21120212121222 is 22212121202112.

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

21120212121222 is an admirable number.

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, 1760017676763 + ... + 1760017676774.

It is an arithmetic number, because the mean of its divisors is an integer number (5280053030307).

Almost surely, 2^{21120212121222} is an apocalyptic number.

21120212121222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120212121222 is a wasteful number, since it uses less digits than its factorization.

21120212121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520035353542.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21120212121222 its reverse (22212121202112), we get a palindrome (43332333323334).

The spelling of 21120212121222 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-two".