30102120221 has 4 divisors (see below), whose sum is σ = 30742590912. Its totient is φ = 29461649532.

The previous prime is 30102120163. The next prime is 30102120233. The reversal of 30102120221 is 12202120103.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12202120103 = 23 ⋅530526961.

It is a cyclic number.

It is not a de Polignac number, because 30102120221 - 2²² = 30097925917 is a prime.

It is a super-2 number, since 2×30102120221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30102120196 and 30102120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30102120271) 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, 320235275 + ... + 320235368.

It is an arithmetic number, because the mean of its divisors is an integer number (7685647728).

Almost surely, 2^30102120221 is an apocalyptic number.

It is an amenable number.

30102120221 is a deficient number, since it is larger than the sum of its proper divisors (640470691).

30102120221 is an equidigital number, since it uses as much as digits as its factorization.

30102120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640470690.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 30102120221 its reverse (12202120103), we get a palindrome (42304240324).

The spelling of 30102120221 in words is "thirty billion, one hundred two million, one hundred twenty thousand, two hundred twenty-one".