1221212210022 has 96 divisors (see below), whose sum is σ = 3177908228352. Its totient is φ = 331592450112.

The previous prime is 1221212210011. The next prime is 1221212210077. The reversal of 1221212210022 is 2200122121221.

It is a happy number.

1221212210022 is a `hidden beast` number, since 1 + 221 + 212 + 210 + 0 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221212209977 and 1221212210004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2845468 + ... + 3246399.

It is an arithmetic number, because the mean of its divisors is an integer number (33103210712).

Almost surely, 2^{1221212210022} is an apocalyptic number.

1221212210022 is an abundant number, since it is smaller than the sum of its proper divisors (1956696018330).

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

1221212210022 is a wasteful number, since it uses less digits than its factorization.

1221212210022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6091962 (or 6091959 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221212210022 its reverse (2200122121221), we get a palindrome (3421334331243).

The spelling of 1221212210022 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, twenty-two".