211053256561 has 16 divisors (see below), whose sum is σ = 241847020800. Its totient is φ = 180420968448.

The previous prime is 211053256559. The next prime is 211053256613. The reversal of 211053256561 is 165652350112.

It is a happy number.

It is not a de Polignac number, because 211053256561 - 2¹ = 211053256559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211053256561.

It is not an unprimeable number, because it can be changed into a prime (211053256061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3973185 + ... + 4025953.

It is an arithmetic number, because the mean of its divisors is an integer number (15115438800).

Almost surely, 2^211053256561 is an apocalyptic number.

It is an amenable number.

211053256561 is a deficient number, since it is larger than the sum of its proper divisors (30793764239).

211053256561 is an equidigital number, since it uses as much as digits as its factorization.

211053256561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54288.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 211053256561 in words is "two hundred eleven billion, fifty-three million, two hundred fifty-six thousand, five hundred sixty-one".