211561030 has 16 divisors (see below), whose sum is σ = 381582000. Its totient is φ = 84452832.

The previous prime is 211561013. The next prime is 211561033. The reversal of 211561030 is 30165112.

211561030 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 211560989 and 211561007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211561033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16209 + ... + 26188.

It is an arithmetic number, because the mean of its divisors is an integer number (23848875).

Almost surely, 2^211561030 is an apocalyptic number.

211561030 is a deficient number, since it is larger than the sum of its proper divisors (170020970).

211561030 is a wasteful number, since it uses less digits than its factorization.

211561030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42903.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 211561030 is about 14545.1376755258. The cubic root of 211561030 is about 595.8613610084.

The spelling of 211561030 in words is "two hundred eleven million, five hundred sixty-one thousand, thirty".