102210120021 has 4 divisors (see below), whose sum is σ = 136280160032. Its totient is φ = 68140080012.

The previous prime is 102210120011. The next prime is 102210120041. The reversal of 102210120021 is 120021012201.

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.

It is not a de Polignac number, because 102210120021 - 2²⁷ = 102075902293 is a prime.

It is a super-3 number, since 3×102210120021³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102210119979 and 102210120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102210120011) 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, 17035020001 + ... + 17035020006.

It is an arithmetic number, because the mean of its divisors is an integer number (34070040008).

Almost surely, 2^102210120021 is an apocalyptic number.

It is an amenable number.

102210120021 is a deficient number, since it is larger than the sum of its proper divisors (34070040011).

102210120021 is an equidigital number, since it uses as much as digits as its factorization.

102210120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34070040010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102210120021 its reverse (120021012201), we get a palindrome (222231132222).

The spelling of 102210120021 in words is "one hundred two billion, two hundred ten million, one hundred twenty thousand, twenty-one".