1221012011112 has 32 divisors (see below), whose sum is σ = 3185248726080. Its totient is φ = 389308177280.

The previous prime is 1221012011111. The next prime is 1221012011129. The reversal of 1221012011112 is 2111102101221.

It is a happy number.

It is a super-2 number, since 2×1221012011112² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221012011091 and 1221012011100.

It is not an unprimeable number, because it can be changed into a prime (1221012011111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1105988589 + ... + 1105989692.

It is an arithmetic number, because the mean of its divisors is an integer number (99539022690).

Almost surely, 2^{1221012011112} is an apocalyptic number.

1221012011112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221012011112 is an abundant number, since it is smaller than the sum of its proper divisors (1964236714968).

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

1221012011112 is a wasteful number, since it uses less digits than its factorization.

1221012011112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211978313 (or 2211978309 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221012011112 its reverse (2111102101221), we get a palindrome (3332114112333).

The spelling of 1221012011112 in words is "one trillion, two hundred twenty-one billion, twelve million, eleven thousand, one hundred twelve".