102212421 has 4 divisors (see below), whose sum is σ = 136283232. Its totient is φ = 68141612.

The previous prime is 102212417. The next prime is 102212423. The reversal of 102212421 is 124212201.

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 a cyclic number.

It is not a de Polignac number, because 102212421 - 2² = 102212417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102212421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102212423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17035401 + ... + 17035406.

It is an arithmetic number, because the mean of its divisors is an integer number (34070808).

Almost surely, 2^102212421 is an apocalyptic number.

It is an amenable number.

102212421 is a deficient number, since it is larger than the sum of its proper divisors (34070811).

102212421 is an equidigital number, since it uses as much as digits as its factorization.

102212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34070810.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 102212421 is about 10110.0158753585. The cubic root of 102212421 is about 467.5569945860.

Adding to 102212421 its reverse (124212201), we get a palindrome (226424622).

The spelling of 102212421 in words is "one hundred two million, two hundred twelve thousand, four hundred twenty-one".