102212100021 has 4 divisors (see below), whose sum is σ = 136282800032. Its totient is φ = 68141400012.

The previous prime is 102212099987. The next prime is 102212100037. The reversal of 102212100021 is 120001212201.

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 102212100021 - 2¹¹ = 102212097973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102212100061) 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, 17035350001 + ... + 17035350006.

It is an arithmetic number, because the mean of its divisors is an integer number (34070700008).

Almost surely, 2^102212100021 is an apocalyptic number.

It is an amenable number.

102212100021 is a deficient number, since it is larger than the sum of its proper divisors (34070700011).

102212100021 is an equidigital number, since it uses as much as digits as its factorization.

102212100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34070700010.

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

Adding to 102212100021 its reverse (120001212201), we get a palindrome (222213312222).

The spelling of 102212100021 in words is "one hundred two billion, two hundred twelve million, one hundred thousand, twenty-one".