102144505221 has 32 divisors (see below), whose sum is σ = 165214800000. Its totient is φ = 61855971840.

The previous prime is 102144505207. The next prime is 102144505231. The reversal of 102144505221 is 122505441201.

It is a happy number.

102144505221 is a `hidden beast` number, since 10 + 2 + 144 + 505 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 102144505221 - 2¹³ = 102144497029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102144505201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233275 + ... + 508631.

It is an arithmetic number, because the mean of its divisors is an integer number (5162962500).

Almost surely, 2^102144505221 is an apocalyptic number.

102144505221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102144505221 is a deficient number, since it is larger than the sum of its proper divisors (63070294779).

102144505221 is a wasteful number, since it uses less digits than its factorization.

102144505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276626 (or 276620 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 102144505221 its reverse (122505441201), we get a palindrome (224649946422).

The spelling of 102144505221 in words is "one hundred two billion, one hundred forty-four million, five hundred five thousand, two hundred twenty-one".