30101220021 has 4 divisors (see below), whose sum is σ = 40134960032. Its totient is φ = 20067480012.

The previous prime is 30101220013. The next prime is 30101220043. The reversal of 30101220021 is 12002210103.

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 not a de Polignac number, because 30101220021 - 2³ = 30101220013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30101219979 and 30101220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30101240021) 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, 5016870001 + ... + 5016870006.

It is an arithmetic number, because the mean of its divisors is an integer number (10033740008).

Almost surely, 2^30101220021 is an apocalyptic number.

It is an amenable number.

30101220021 is a deficient number, since it is larger than the sum of its proper divisors (10033740011).

30101220021 is a wasteful number, since it uses less digits than its factorization.

30101220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10033740010.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 30101220021 its reverse (12002210103), we get a palindrome (42103430124).

The spelling of 30101220021 in words is "thirty billion, one hundred one million, two hundred twenty thousand, twenty-one".