1221212100022 has 8 divisors (see below), whose sum is σ = 1831856846616. Its totient is φ = 610593151152.

The previous prime is 1221212100019. The next prime is 1221212100077. The reversal of 1221212100022 is 2200012121221.

It is a happy number.

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

It is a super-3 number, since 3×1221212100022³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221212099969 and 1221212100005.

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 in 3 ways as a sum of consecutive naturals, for example, 6330648 + ... + 6520699.

It is an arithmetic number, because the mean of its divisors is an integer number (228982105827).

Almost surely, 2^{1221212100022} is an apocalyptic number.

1221212100022 is a deficient number, since it is larger than the sum of its proper divisors (610644746594).

1221212100022 is a wasteful number, since it uses less digits than its factorization.

1221212100022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12898862.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221212100022 its reverse (2200012121221), we get a palindrome (3421224221243).

The spelling of 1221212100022 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thousand, twenty-two".