211013656 has 32 divisors (see below), whose sum is σ = 478772640. Its totient is φ = 85114368.

The previous prime is 211013629. The next prime is 211013659. The reversal of 211013656 is 656310112.

It is a self number, because there is not a number n which added to its sum of digits gives 211013656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211013659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109875 + ... + 111778.

It is an arithmetic number, because the mean of its divisors is an integer number (14961645).

Almost surely, 2^211013656 is an apocalyptic number.

It is an amenable number.

211013656 is an abundant number, since it is smaller than the sum of its proper divisors (267758984).

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

211013656 is a wasteful number, since it uses less digits than its factorization.

211013656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221683 (or 221679 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 211013656 is about 14526.3090976339. The cubic root of 211013656 is about 595.3470244548.

Adding to 211013656 its reverse (656310112), we get a palindrome (867323768).

The spelling of 211013656 in words is "two hundred eleven million, thirteen thousand, six hundred fifty-six".