30000121100021 has 4 divisors (see below), whose sum is σ = 30001293509100. Its totient is φ = 29998948690944.

The previous prime is 30000121100009. The next prime is 30000121100029. The reversal of 30000121100021 is 12000112100003.

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 23884342639921 + 6115778460100 = 4887161^2 + 2473010^2 .

It is a cyclic number.

It is not a de Polignac number, because 30000121100021 - 2²⁶ = 30000053991157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30000121099975 and 30000121100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000121100029) 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, 586166156 + ... + 586217333.

It is an arithmetic number, because the mean of its divisors is an integer number (7500323377275).

Almost surely, 2^{30000121100021} is an apocalyptic number.

It is an amenable number.

30000121100021 is a deficient number, since it is larger than the sum of its proper divisors (1172409079).

30000121100021 is a wasteful number, since it uses less digits than its factorization.

30000121100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172409078.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 30000121100021 its reverse (12000112100003), we get a palindrome (42000233200024).

The spelling of 30000121100021 in words is "thirty trillion, one hundred twenty-one million, one hundred thousand, twenty-one".