30002131021 has 4 divisors (see below), whose sum is σ = 30002640444. Its totient is φ = 30001621600.

The previous prime is 30002131007. The next prime is 30002131037. The reversal of 30002131021 is 12013120003.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12013120003 = 37 ⋅324678919.

It can be written as a sum of positive squares in 2 ways, for example, as 17322244996 + 12679886025 = 131614^2 + 112605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30002131021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30002130992 and 30002131010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30002131001) 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, 152770 + ... + 288691.

It is an arithmetic number, because the mean of its divisors is an integer number (7500660111).

Almost surely, 2^30002131021 is an apocalyptic number.

It is an amenable number.

30002131021 is a deficient number, since it is larger than the sum of its proper divisors (509423).

30002131021 is an equidigital number, since it uses as much as digits as its factorization.

30002131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509422.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 30002131021 its reverse (12013120003), we get a palindrome (42015251024).

The spelling of 30002131021 in words is "thirty billion, two million, one hundred thirty-one thousand, twenty-one".