102101321021 has 12 divisors (see below), whose sum is σ = 118800488700. Its totient is φ = 87493633920.

The previous prime is 102101320973. The next prime is 102101321027. The reversal of 102101321021 is 120123101201.

It can be written as a sum of positive squares in 2 ways, for example, as 31680084121 + 70421236900 = 177989^2 + 265370^2 .

It is a de Polignac number, because none of the positive numbers 2^k-102101321021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102101320987 and 102101321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102101321027) 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, 58910 + ... + 455711.

It is an arithmetic number, because the mean of its divisors is an integer number (9900040725).

Almost surely, 2^102101321021 is an apocalyptic number.

It is an amenable number.

102101321021 is a deficient number, since it is larger than the sum of its proper divisors (16699167679).

102101321021 is an equidigital number, since it uses as much as digits as its factorization.

102101321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518684 (or 518677 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 102101321021 its reverse (120123101201), we get a palindrome (222224422222).

The spelling of 102101321021 in words is "one hundred two billion, one hundred one million, three hundred twenty-one thousand, twenty-one".