1221010122112 has 32 divisors (see below), whose sum is σ = 2653615751400. Its totient is φ = 555004600320.

The previous prime is 1221010122067. The next prime is 1221010122121. The reversal of 1221010122112 is 2112210101221.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1221010122112² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 433595937 + ... + 433598752.

Almost surely, 2^{1221010122112} is an apocalyptic number.

It is an amenable number.

1221010122112 is an abundant number, since it is smaller than the sum of its proper divisors (1432605629288).

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

1221010122112 is an equidigital number, since it uses as much as digits as its factorization.

1221010122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867194714 (or 867194702 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221010122112 its reverse (2112210101221), we get a palindrome (3333220223333).

The spelling of 1221010122112 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred twenty-two thousand, one hundred twelve".