102121144 has 8 divisors (see below), whose sum is σ = 191477160. Its totient is φ = 51060568.

The previous prime is 102121141. The next prime is 102121157. The reversal of 102121144 is 441121201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6382564 + ... + 6382579.

It is an arithmetic number, because the mean of its divisors is an integer number (23934645).

Almost surely, 2^102121144 is an apocalyptic number.

It is an amenable number.

102121144 is a deficient number, since it is larger than the sum of its proper divisors (89356016).

102121144 is a wasteful number, since it uses less digits than its factorization.

102121144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12765149 (or 12765145 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 102121144 is about 10105.5006803226. The cubic root of 102121144 is about 467.4177750096.

Adding to 102121144 its reverse (441121201), we get a palindrome (543242345).

The spelling of 102121144 in words is "one hundred two million, one hundred twenty-one thousand, one hundred forty-four".