30042120861 has 24 divisors (see below), whose sum is σ = 45036429984. Its totient is φ = 20012475600.

The previous prime is 30042120859. The next prime is 30042120923. The reversal of 30042120861 is 16802124003.

30042120861 is a `hidden beast` number, since 30 + 0 + 421 + 208 + 6 + 1 = 666.

It is not a de Polignac number, because 30042120861 - 2¹ = 30042120859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30042127861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268630 + ... + 363656.

It is an arithmetic number, because the mean of its divisors is an integer number (1876517916).

Almost surely, 2^30042120861 is an apocalyptic number.

It is an amenable number.

30042120861 is a deficient number, since it is larger than the sum of its proper divisors (14994309123).

30042120861 is an equidigital number, since it uses as much as digits as its factorization.

30042120861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96343 (or 96331 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 30042120861 its reverse (16802124003), we get a palindrome (46844244864).

The spelling of 30042120861 in words is "thirty billion, forty-two million, one hundred twenty thousand, eight hundred sixty-one".