21078772214 has 8 divisors (see below), whose sum is σ = 32638099008. Its totient is φ = 10199405880.

The previous prime is 21078772201. The next prime is 21078772217. The reversal of 21078772214 is 41227787012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21078772217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169990037 + ... + 169990160.

It is an arithmetic number, because the mean of its divisors is an integer number (4079762376).

Almost surely, 2^21078772214 is an apocalyptic number.

21078772214 is a deficient number, since it is larger than the sum of its proper divisors (11559326794).

21078772214 is a wasteful number, since it uses less digits than its factorization.

21078772214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339980230.

The product of its (nonzero) digits is 87808, while the sum is 41.

The spelling of 21078772214 in words is "twenty-one billion, seventy-eight million, seven hundred seventy-two thousand, two hundred fourteen".