102001011221 has 8 divisors (see below), whose sum is σ = 105527583000. Its totient is φ = 98475059200.

The previous prime is 102001011209. The next prime is 102001011289. The reversal of 102001011221 is 122110100201.

It can be written as a sum of positive squares in 4 ways, for example, as 47856375121 + 54144636100 = 218761^2 + 232690^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102001011221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001017221) 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, 193205 + ... + 491253.

It is an arithmetic number, because the mean of its divisors is an integer number (13190947875).

Almost surely, 2^102001011221 is an apocalyptic number.

It is an amenable number.

102001011221 is a deficient number, since it is larger than the sum of its proper divisors (3526571779).

102001011221 is a wasteful number, since it uses less digits than its factorization.

102001011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309879.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102001011221 its reverse (122110100201), we get a palindrome (224111111422).

The spelling of 102001011221 in words is "one hundred two billion, one million, eleven thousand, two hundred twenty-one".