30011221021 has 4 divisors (see below), whose sum is σ = 30012738112. Its totient is φ = 30009703932.

The previous prime is 30011221001. The next prime is 30011221061. The reversal of 30011221021 is 12012211003.

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 30011221021 - 2⁵ = 30011220989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30011220992 and 30011221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30011221001) 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, 728475 + ... + 768568.

It is an arithmetic number, because the mean of its divisors is an integer number (7503184528).

Almost surely, 2^30011221021 is an apocalyptic number.

It is an amenable number.

30011221021 is a deficient number, since it is larger than the sum of its proper divisors (1517091).

30011221021 is a wasteful number, since it uses less digits than its factorization.

30011221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517090.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 30011221021 its reverse (12012211003), we get a palindrome (42023432024).

The spelling of 30011221021 in words is "thirty billion, eleven million, two hundred twenty-one thousand, twenty-one".