30013120220021 has 4 divisors (see below), whose sum is σ = 30052767671532. Its totient is φ = 29973472768512.

The previous prime is 30013120219933. The next prime is 30013120220033. The reversal of 30013120220021 is 12002202131003.

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 11119223702500 + 18893896517521 = 3334550^2 + 4346711^2 .

It is a cyclic number.

It is not a de Polignac number, because 30013120220021 - 2³⁸ = 29738242313077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30013120220521) 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, 19823724620 + ... + 19823726133.

It is an arithmetic number, because the mean of its divisors is an integer number (7513191917883).

Almost surely, 2^{30013120220021} is an apocalyptic number.

It is an amenable number.

30013120220021 is a deficient number, since it is larger than the sum of its proper divisors (39647451511).

30013120220021 is an equidigital number, since it uses as much as digits as its factorization.

30013120220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39647451510.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 30013120220021 its reverse (12002202131003), we get a palindrome (42015322351024).

The spelling of 30013120220021 in words is "thirty trillion, thirteen billion, one hundred twenty million, two hundred twenty thousand, twenty-one".