102131444421 has 12 divisors (see below), whose sum is σ = 147563806572. Its totient is φ = 68068886976.

The previous prime is 102131444417. The next prime is 102131444423. The reversal of 102131444421 is 124444131201.

102131444421 is a `hidden beast` number, since 1 + 0 + 213 + 1 + 4 + 4 + 442 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14346050625 + 87785393796 = 119775^2 + 296286^2 .

It is not a de Polignac number, because 102131444421 - 2² = 102131444417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102131444423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1527336 + ... + 1592801.

It is an arithmetic number, because the mean of its divisors is an integer number (12296983881).

Almost surely, 2^102131444421 is an apocalyptic number.

It is an amenable number.

102131444421 is a deficient number, since it is larger than the sum of its proper divisors (45432362151).

102131444421 is a wasteful number, since it uses less digits than its factorization.

102131444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123780 (or 3123777 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 102131444421 its reverse (124444131201), we get a palindrome (226575575622).

The spelling of 102131444421 in words is "one hundred two billion, one hundred thirty-one million, four hundred forty-four thousand, four hundred twenty-one".