102010101221 has 4 divisors (see below), whose sum is σ = 116582972832. Its totient is φ = 87437229612.

The previous prime is 102010101217. The next prime is 102010101229. The reversal of 102010101221 is 122101010201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122101010201 = 3769 ⋅32396129.

It is a cyclic number.

It is not a de Polignac number, because 102010101221 - 2² = 102010101217 is a prime.

It is a super-2 number, since 2×102010101221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102010101229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7286435795 + ... + 7286435808.

It is an arithmetic number, because the mean of its divisors is an integer number (29145743208).

Almost surely, 2^102010101221 is an apocalyptic number.

It is an amenable number.

102010101221 is a deficient number, since it is larger than the sum of its proper divisors (14572871611).

102010101221 is an equidigital number, since it uses as much as digits as its factorization.

102010101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14572871610.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102010101221 its reverse (122101010201), we get a palindrome (224111111422).

The spelling of 102010101221 in words is "one hundred two billion, ten million, one hundred one thousand, two hundred twenty-one".