1221420043012 has 48 divisors (see below), whose sum is σ = 2349127796400. Its totient is φ = 552284282880.

The previous prime is 1221420042979. The next prime is 1221420043021. The reversal of 1221420043012 is 2103400241221.

It can be written as a sum of positive squares in 8 ways, for example, as 185678257216 + 1035741785796 = 430904^2 + 1017714^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 706189 + ... + 1715092.

It is an arithmetic number, because the mean of its divisors is an integer number (48940162425).

Almost surely, 2^{1221420043012} is an apocalyptic number.

It is an amenable number.

1221420043012 is a deficient number, since it is larger than the sum of its proper divisors (1127707753388).

1221420043012 is a wasteful number, since it uses less digits than its factorization.

1221420043012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421496 (or 2421494 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1221420043012 its reverse (2103400241221), we get a palindrome (3324820284233).

The spelling of 1221420043012 in words is "one trillion, two hundred twenty-one billion, four hundred twenty million, forty-three thousand, twelve".