1200002101221 has 32 divisors (see below), whose sum is σ = 1996371283968. Its totient is φ = 622889403840.

The previous prime is 1200002101217. The next prime is 1200002101339. The reversal of 1200002101221 is 1221012000021.

It is not a de Polignac number, because 1200002101221 - 2² = 1200002101217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200002101197 and 1200002101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200002101721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1739005 + ... + 2328978.

It is an arithmetic number, because the mean of its divisors is an integer number (62386602624).

Almost surely, 2^{1200002101221} is an apocalyptic number.

1200002101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200002101221 is a deficient number, since it is larger than the sum of its proper divisors (796369182747).

1200002101221 is a wasteful number, since it uses less digits than its factorization.

1200002101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069281.

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

Adding to 1200002101221 its reverse (1221012000021), we get a palindrome (2421014101242).

The spelling of 1200002101221 in words is "one trillion, two hundred billion, two million, one hundred one thousand, two hundred twenty-one".