102111022121221 has 4 divisors (see below), whose sum is σ = 108117552834252. Its totient is φ = 96104491408192.

The previous prime is 102111022121177. The next prime is 102111022121231. The reversal of 102111022121221 is 122121220111201.

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 44672661105121 + 57438361016100 = 6683761^2 + 7578810^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111022121221 - 2¹⁹ = 102111021596933 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 (102111022121231) 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, 3003265356490 + ... + 3003265356523.

It is an arithmetic number, because the mean of its divisors is an integer number (27029388208563).

Almost surely, 2^{102111022121221} is an apocalyptic number.

It is an amenable number.

102111022121221 is a deficient number, since it is larger than the sum of its proper divisors (6006530713031).

102111022121221 is an equidigital number, since it uses as much as digits as its factorization.

102111022121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6006530713030.

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

Adding to 102111022121221 its reverse (122121220111201), we get a palindrome (224232242232422).

The spelling of 102111022121221 in words is "one hundred two trillion, one hundred eleven billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".