102001121000221 has 4 divisors (see below), whose sum is σ = 102222381566844. Its totient is φ = 101779860433600.

The previous prime is 102001121000167. The next prime is 102001121000231. The reversal of 102001121000221 is 122000121100201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18892627299225 + 83108493700996 = 4346565^2 + 9116386^2 .

It is a cyclic number.

It is not a de Polignac number, because 102001121000221 - 2²³ = 102001112611613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001121000231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110630282620 + ... + 110630283541.

It is an arithmetic number, because the mean of its divisors is an integer number (25555595391711).

Almost surely, 2^{102001121000221} is an apocalyptic number.

It is an amenable number.

102001121000221 is a deficient number, since it is larger than the sum of its proper divisors (221260566623).

102001121000221 is an equidigital number, since it uses as much as digits as its factorization.

102001121000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221260566622.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102001121000221 its reverse (122000121100201), we get a palindrome (224001242100422).

The spelling of 102001121000221 in words is "one hundred two trillion, one billion, one hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.