21390116234 has 8 divisors (see below), whose sum is σ = 32092348068. Its totient is φ = 10692666880.

The previous prime is 21390116233. The next prime is 21390116239. The reversal of 21390116234 is 43261109312.

It can be written as a sum of positive squares in 2 ways, for example, as 18337222225 + 3052894009 = 135415^2 + 55253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21390116234.

It is not an unprimeable number, because it can be changed into a prime (21390116233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184417 + ... + 1202340.

Almost surely, 2^21390116234 is an apocalyptic number.

21390116234 is a deficient number, since it is larger than the sum of its proper divisors (10702231834).

21390116234 is a wasteful number, since it uses less digits than its factorization.

21390116234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391240.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 21390116234 in words is "twenty-one billion, three hundred ninety million, one hundred sixteen thousand, two hundred thirty-four".