102121012221 has 8 divisors (see below), whose sum is σ = 136337499360. Its totient is φ = 67992599952.

The previous prime is 102121012219. The next prime is 102121012241. The reversal of 102121012221 is 122210121201.

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

It is not a de Polignac number, because 102121012221 - 2¹ = 102121012219 is a prime.

It is a super-2 number, since 2×102121012221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 102121012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121012211) 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, 22016011 + ... + 22020648.

It is an arithmetic number, because the mean of its divisors is an integer number (17042187420).

Almost surely, 2^102121012221 is an apocalyptic number.

It is an amenable number.

102121012221 is a deficient number, since it is larger than the sum of its proper divisors (34216487139).

102121012221 is an equidigital number, since it uses as much as digits as its factorization.

102121012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44037435.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 102121012221 its reverse (122210121201), we get a palindrome (224331133422).

The spelling of 102121012221 in words is "one hundred two billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".