1200012001221 has 16 divisors (see below), whose sum is σ = 1749618036288. Its totient is φ = 725552486400.

The previous prime is 1200012001219. The next prime is 1200012001261. The reversal of 1200012001221 is 1221002100021.

It is not a de Polignac number, because 1200012001221 - 2¹ = 1200012001219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200012001197 and 1200012001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200012001211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43173756 + ... + 43201541.

It is an arithmetic number, because the mean of its divisors is an integer number (109351127268).

Almost surely, 2^{1200012001221} is an apocalyptic number.

1200012001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200012001221 is a deficient number, since it is larger than the sum of its proper divisors (549606035067).

1200012001221 is a wasteful number, since it uses less digits than its factorization.

1200012001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86375732.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1200012001221 its reverse (1221002100021), we get a palindrome (2421014101242).

The spelling of 1200012001221 in words is "one trillion, two hundred billion, twelve million, one thousand, two hundred twenty-one".