102212111021221 has 4 divisors (see below), whose sum is σ = 102214333601100. Its totient is φ = 102209888441344.

The previous prime is 102212111021197. The next prime is 102212111021227. The reversal of 102212111021221 is 122120111212201.

It is a happy number.

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 29980979789121 + 72231131232100 = 5475489^2 + 8498890^2 .

It is a cyclic number.

It is not a de Polignac number, because 102212111021221 - 2⁹ = 102212111020709 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 (102212111021227) 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, 1111220956 + ... + 1111312933.

It is an arithmetic number, because the mean of its divisors is an integer number (25553583400275).

Almost surely, 2^{102212111021221} is an apocalyptic number.

It is an amenable number.

102212111021221 is a deficient number, since it is larger than the sum of its proper divisors (2222579879).

102212111021221 is an equidigital number, since it uses as much as digits as its factorization.

102212111021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222579878.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 102212111021221 its reverse (122120111212201), we get a palindrome (224332222233422).

The spelling of 102212111021221 in words is "one hundred two trillion, two hundred twelve billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".