30213130121021 has 4 divisors (see below), whose sum is σ = 30915761054112. Its totient is φ = 29510499187932.

The previous prime is 30213130121003. The next prime is 30213130121023. The reversal of 30213130121021 is 12012103131203.

It is a happy number.

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 not a de Polignac number, because 30213130121021 - 2¹⁴ = 30213130104637 is a prime.

It is a super-4 number, since 4×30213130121021⁴ (a number of 55 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30213130120984 and 30213130121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30213130121023) 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, 351315466481 + ... + 351315466566.

It is an arithmetic number, because the mean of its divisors is an integer number (7728940263528).

Almost surely, 2^{30213130121021} is an apocalyptic number.

It is an amenable number.

30213130121021 is a deficient number, since it is larger than the sum of its proper divisors (702630933091).

30213130121021 is an equidigital number, since it uses as much as digits as its factorization.

30213130121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702630933090.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 30213130121021 its reverse (12012103131203), we get a palindrome (42225233252224).

The spelling of 30213130121021 in words is "thirty trillion, two hundred thirteen billion, one hundred thirty million, one hundred twenty-one thousand, twenty-one".