213972784056 has 96 divisors (see below), whose sum is σ = 615571585200. Its totient is φ = 68864745600.

The previous prime is 213972784049. The next prime is 213972784087. The reversal of 213972784056 is 650487279312.

It is a happy number.

213972784056 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×213972784056² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 213972783993 and 213972784011.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 407295 + ... + 770606.

It is a 1-persistent number, because it is pandigital, but 2⋅213972784056 = 427945568112 is not.

Almost surely, 2^213972784056 is an apocalyptic number.

It is an amenable number.

213972784056 is an abundant number, since it is smaller than the sum of its proper divisors (401598801144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213972784056 is a wasteful number, since it uses less digits than its factorization.

213972784056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177974 (or 1177935 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 213972784056 in words is "two hundred thirteen billion, nine hundred seventy-two million, seven hundred eighty-four thousand, fifty-six".