102121214221 has 8 divisors (see below), whose sum is σ = 110291816600. Its totient is φ = 93995629632.

The previous prime is 102121214219. The next prime is 102121214257. The reversal of 102121214221 is 122412121201.

It can be written as a sum of positive squares in 4 ways, for example, as 3486902500 + 98634311721 = 59050^2 + 314061^2 .

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 102121214221 - 2¹ = 102121214219 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 (102121214281) 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, 11249730 + ... + 11258803.

It is an arithmetic number, because the mean of its divisors is an integer number (13786477075).

Almost surely, 2^102121214221 is an apocalyptic number.

It is an amenable number.

102121214221 is a deficient number, since it is larger than the sum of its proper divisors (8170602379).

102121214221 is a wasteful number, since it uses less digits than its factorization.

102121214221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22508895.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 102121214221 its reverse (122412121201), we get a palindrome (224533335422).

The spelling of 102121214221 in words is "one hundred two billion, one hundred twenty-one million, two hundred fourteen thousand, two hundred twenty-one".