102112101012221 has 4 divisors (see below), whose sum is σ = 103510896916572. Its totient is φ = 100713305107872.

The previous prime is 102112101012217. The next prime is 102112101012283. The reversal of 102112101012221 is 122210101211201.

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 87184611052900 + 14927489959321 = 9337270^2 + 3863611^2 .

It is a cyclic number.

It is not a de Polignac number, because 102112101012221 - 2² = 102112101012217 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 102112101012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102112101012121) 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, 699397952066 + ... + 699397952211.

It is an arithmetic number, because the mean of its divisors is an integer number (25877724229143).

Almost surely, 2^{102112101012221} is an apocalyptic number.

It is an amenable number.

102112101012221 is a deficient number, since it is larger than the sum of its proper divisors (1398795904351).

102112101012221 is an equidigital number, since it uses as much as digits as its factorization.

102112101012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398795904350.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 102112101012221 its reverse (122210101211201), we get a palindrome (224322202223422).

The spelling of 102112101012221 in words is "one hundred two trillion, one hundred twelve billion, one hundred one million, twelve thousand, two hundred twenty-one".