30115220261 has 4 divisors (see below), whose sum is σ = 34417394592. Its totient is φ = 25813045932.

The previous prime is 30115220243. The next prime is 30115220263. The reversal of 30115220261 is 16202251103.

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 30115220261 - 2¹⁰ = 30115219237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30115220263) 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, 2151087155 + ... + 2151087168.

It is an arithmetic number, because the mean of its divisors is an integer number (8604348648).

Almost surely, 2^30115220261 is an apocalyptic number.

It is an amenable number.

30115220261 is a deficient number, since it is larger than the sum of its proper divisors (4302174331).

30115220261 is an equidigital number, since it uses as much as digits as its factorization.

30115220261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302174330.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 30115220261 its reverse (16202251103), we get a palindrome (46317471364).

The spelling of 30115220261 in words is "thirty billion, one hundred fifteen million, two hundred twenty thousand, two hundred sixty-one".