102021212202221 has 8 divisors (see below), whose sum is σ = 111670128867864. Its totient is φ = 92629599981120.

The previous prime is 102021212202181. The next prime is 102021212202311. The reversal of 102021212202221 is 122202212120201.

It can be written as a sum of positive squares in 4 ways, for example, as 19732474515625 + 82288737686596 = 4442125^2 + 9071314^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 102021212202221 - 2³⁰ = 102020138460397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102021212202193 and 102021212202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021212202121) 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, 64326110306 + ... + 64326111891.

It is an arithmetic number, because the mean of its divisors is an integer number (13958766108483).

Almost surely, 2^{102021212202221} is an apocalyptic number.

It is an amenable number.

102021212202221 is a deficient number, since it is larger than the sum of its proper divisors (9648916665643).

102021212202221 is a wasteful number, since it uses less digits than its factorization.

102021212202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128652222271.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 102021212202221 its reverse (122202212120201), we get a palindrome (224223424322422).

The spelling of 102021212202221 in words is "one hundred two trillion, twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".