102121022211221 has 4 divisors (see below), whose sum is σ = 109976485458252. Its totient is φ = 94265558964192.

The previous prime is 102121022211209. The next prime is 102121022211293. The reversal of 102121022211221 is 122112220121201.

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 20458533118321 + 81662489092900 = 4523111^2 + 9036730^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121022211221 - 2⁴⁶ = 31752278033557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121022211193 and 102121022211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121022211121) 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, 3927731623496 + ... + 3927731623521.

It is an arithmetic number, because the mean of its divisors is an integer number (27494121364563).

Almost surely, 2^{102121022211221} is an apocalyptic number.

It is an amenable number.

102121022211221 is a deficient number, since it is larger than the sum of its proper divisors (7855463247031).

102121022211221 is an equidigital number, since it uses as much as digits as its factorization.

102121022211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7855463247030.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 102121022211221 its reverse (122112220121201), we get a palindrome (224233242332422).

The spelling of 102121022211221 in words is "one hundred two trillion, one hundred twenty-one billion, twenty-two million, two hundred eleven thousand, two hundred twenty-one".