102021210121 has 4 divisors (see below), whose sum is σ = 102182892544. Its totient is φ = 101859527700.

The previous prime is 102021210119. The next prime is 102021210139. The reversal of 102021210121 is 121012120201.

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: 121012120201 = 7 ⋅17287445743.

It is a cyclic number.

It is not a de Polignac number, because 102021210121 - 2¹ = 102021210119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102021210821) 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, 80840265 + ... + 80841526.

It is an arithmetic number, because the mean of its divisors is an integer number (25545723136).

Almost surely, 2^102021210121 is an apocalyptic number.

It is an amenable number.

102021210121 is a deficient number, since it is larger than the sum of its proper divisors (161682423).

102021210121 is an equidigital number, since it uses as much as digits as its factorization.

102021210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161682422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102021210121 its reverse (121012120201), we get a palindrome (223033330322).

The spelling of 102021210121 in words is "one hundred two billion, twenty-one million, two hundred ten thousand, one hundred twenty-one".