102001210101221 has 4 divisors (see below), whose sum is σ = 102903875677452. Its totient is φ = 101098544524992.

The previous prime is 102001210101209. The next prime is 102001210101223. The reversal of 102001210101221 is 122101012100201.

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 935787304321 + 101065422796900 = 967361^2 + 10053130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102001210101221 is a prime.

It is a super-5 number, since 5×102001210101221⁵ (a number of 71 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102001210101196 and 102001210101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001210101223) 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, 451332787946 + ... + 451332788171.

It is an arithmetic number, because the mean of its divisors is an integer number (25725968919363).

Almost surely, 2^{102001210101221} is an apocalyptic number.

It is an amenable number.

102001210101221 is a deficient number, since it is larger than the sum of its proper divisors (902665576231).

102001210101221 is an equidigital number, since it uses as much as digits as its factorization.

102001210101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902665576230.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102001210101221 its reverse (122101012100201), we get a palindrome (224102222201422).

The spelling of 102001210101221 in words is "one hundred two trillion, one billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".