102021420122 has 4 divisors (see below), whose sum is σ = 153032130186. Its totient is φ = 51010710060.

The previous prime is 102021420071. The next prime is 102021420157. The reversal of 102021420122 is 221024120201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221024120201 = 29147 ⋅7583083.

It can be written as a sum of positive squares in only one way, i.e., 79023394321 + 22998025801 = 281111^2 + 151651^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 102021420122.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 25505355029 + ... + 25505355032.

Almost surely, 2^102021420122 is an apocalyptic number.

102021420122 is a deficient number, since it is larger than the sum of its proper divisors (51010710064).

102021420122 is an equidigital number, since it uses as much as digits as its factorization.

102021420122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51010710063.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 102021420122 its reverse (221024120201), we get a palindrome (323045540323).

The spelling of 102021420122 in words is "one hundred two billion, twenty-one million, four hundred twenty thousand, one hundred twenty-two".