1021200000221 has 8 divisors (see below), whose sum is σ = 1054161957888. Its totient is φ = 988239294000.

The previous prime is 1021200000211. The next prime is 1021200000229. The reversal of 1021200000221 is 1220000021201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021200000221 - 2³⁸ = 746322093277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021200000229) 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, 1515131 + ... + 2082791.

It is an arithmetic number, because the mean of its divisors is an integer number (131770244736).

Almost surely, 2^{1021200000221} is an apocalyptic number.

It is an amenable number.

1021200000221 is a deficient number, since it is larger than the sum of its proper divisors (32961957667).

1021200000221 is an equidigital number, since it uses as much as digits as its factorization.

1021200000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625723.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1021200000221 its reverse (1220000021201), we get a palindrome (2241200021422).

The spelling of 1021200000221 in words is "one trillion, twenty-one billion, two hundred million, two hundred twenty-one", and thus it is an aban number.