102031213021 has 4 divisors (see below), whose sum is σ = 102032470044. Its totient is φ = 102029956000.

The previous prime is 102031213019. The next prime is 102031213033. The reversal of 102031213021 is 120312130201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82707432921 + 19323780100 = 287589^2 + 139010^2 .

It is a cyclic number.

It is not a de Polignac number, because 102031213021 - 2¹ = 102031213019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102031212986 and 102031213004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102031211021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497680 + ... + 672121.

It is an arithmetic number, because the mean of its divisors is an integer number (25508117511).

Almost surely, 2^102031213021 is an apocalyptic number.

It is an amenable number.

102031213021 is a deficient number, since it is larger than the sum of its proper divisors (1257023).

102031213021 is an equidigital number, since it uses as much as digits as its factorization.

102031213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257022.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 102031213021 its reverse (120312130201), we get a palindrome (222343343222).

The spelling of 102031213021 in words is "one hundred two billion, thirty-one million, two hundred thirteen thousand, twenty-one".