30031100021 has 8 divisors (see below), whose sum is σ = 32343256344. Its totient is φ = 27719239680.

The previous prime is 30031100003. The next prime is 30031100027. The reversal of 30031100021 is 12000113003.

It can be written as a sum of positive squares in 4 ways, for example, as 5911456996 + 24119643025 = 76886^2 + 155305^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30031100021 - 2¹⁰ = 30031098997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30031099975 and 30031100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30031100027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165461 + ... + 295701.

It is an arithmetic number, because the mean of its divisors is an integer number (4042907043).

Almost surely, 2^30031100021 is an apocalyptic number.

It is an amenable number.

30031100021 is a deficient number, since it is larger than the sum of its proper divisors (2312156323).

30031100021 is a wasteful number, since it uses less digits than its factorization.

30031100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147991.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 30031100021 its reverse (12000113003), we get a palindrome (42031213024).

The spelling of 30031100021 in words is "thirty billion, thirty-one million, one hundred thousand, twenty-one".