102003121021 has 4 divisors (see below), whose sum is σ = 102051442944. Its totient is φ = 101954799100.

The previous prime is 102003121009. The next prime is 102003121109. The reversal of 102003121021 is 120121300201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102003121021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102003120992 and 102003121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102003128021) 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, 24157795 + ... + 24162016.

It is an arithmetic number, because the mean of its divisors is an integer number (25512860736).

Almost surely, 2^102003121021 is an apocalyptic number.

It is an amenable number.

102003121021 is a deficient number, since it is larger than the sum of its proper divisors (48321923).

102003121021 is an equidigital number, since it uses as much as digits as its factorization.

102003121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48321922.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 102003121021 its reverse (120121300201), we get a palindrome (222124421222).

The spelling of 102003121021 in words is "one hundred two billion, three million, one hundred twenty-one thousand, twenty-one".