1221233211012 has 24 divisors (see below), whose sum is σ = 2850270637536. Its totient is φ = 406973954368.

The previous prime is 1221233210993. The next prime is 1221233211067. The reversal of 1221233211012 is 2101123321221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221233211012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12923793 + ... + 13017944.

It is an arithmetic number, because the mean of its divisors is an integer number (118761276564).

Almost surely, 2^{1221233211012} is an apocalyptic number.

1221233211012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221233211012 is an abundant number, since it is smaller than the sum of its proper divisors (1629037426524).

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

1221233211012 is a wasteful number, since it uses less digits than its factorization.

1221233211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25945667 (or 25945665 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1221233211012 its reverse (2101123321221), we get a palindrome (3322356532233).

The spelling of 1221233211012 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-three million, two hundred eleven thousand, twelve".