102109901221 has 4 divisors (see below), whose sum is σ = 103120890444. Its totient is φ = 101098912000.

The previous prime is 102109901207. The next prime is 102109901261. The reversal of 102109901221 is 122109901201.

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 63738576225 + 38371324996 = 252465^2 + 195886^2 .

It is a cyclic number.

It is not a de Polignac number, because 102109901221 - 2⁹ = 102109900709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102109901221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102109901261) 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, 505494460 + ... + 505494661.

It is an arithmetic number, because the mean of its divisors is an integer number (25780222611).

Almost surely, 2^102109901221 is an apocalyptic number.

It is an amenable number.

102109901221 is a deficient number, since it is larger than the sum of its proper divisors (1010989223).

102109901221 is a wasteful number, since it uses less digits than its factorization.

102109901221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010989222.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 102109901221 in words is "one hundred two billion, one hundred nine million, nine hundred one thousand, two hundred twenty-one".