211556456054 has 4 divisors (see below), whose sum is σ = 317334684084. Its totient is φ = 105778228026.

The previous prime is 211556456047. The next prime is 211556456057. The reversal of 211556456054 is 450654655112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×211556456054² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211556455996 and 211556456014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211556456057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52889114012 + ... + 52889114015.

It is an arithmetic number, because the mean of its divisors is an integer number (79333671021).

Almost surely, 2^211556456054 is an apocalyptic number.

211556456054 is a deficient number, since it is larger than the sum of its proper divisors (105778228030).

211556456054 is a wasteful number, since it uses less digits than its factorization.

211556456054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105778228029.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 211556456054 in words is "two hundred eleven billion, five hundred fifty-six million, four hundred fifty-six thousand, fifty-four".