102213121 has 4 divisors (see below), whose sum is σ = 102416832. Its totient is φ = 102009412.

The previous prime is 102213113. The next prime is 102213151. The reversal of 102213121 is 121312201.

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: 121312201 = 59 ⋅2056139.

It is a cyclic number.

It is not a de Polignac number, because 102213121 - 2³ = 102213113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102213101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101101 + ... + 102106.

It is an arithmetic number, because the mean of its divisors is an integer number (25604208).

Almost surely, 2^102213121 is an apocalyptic number.

It is an amenable number.

102213121 is a deficient number, since it is larger than the sum of its proper divisors (203711).

102213121 is an equidigital number, since it uses as much as digits as its factorization.

102213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203710.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 102213121 is about 10110.0504944337. The cubic root of 102213121 is about 467.5580619356.

Adding to 102213121 its reverse (121312201), we get a palindrome (223525322).

The spelling of 102213121 in words is "one hundred two million, two hundred thirteen thousand, one hundred twenty-one".