211531245542 has 4 divisors (see below), whose sum is σ = 317296868316. Its totient is φ = 105765622770.

The previous prime is 211531245503. The next prime is 211531245587. The reversal of 211531245542 is 245542135112.

211531245542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-3 number, since 3×211531245542³ (a number of 35 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 52882811384 + ... + 52882811387.

It is an arithmetic number, because the mean of its divisors is an integer number (79324217079).

Almost surely, 2^211531245542 is an apocalyptic number.

211531245542 is a deficient number, since it is larger than the sum of its proper divisors (105765622774).

211531245542 is a wasteful number, since it uses less digits than its factorization.

211531245542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105765622773.

The product of its digits is 48000, while the sum is 35.

The spelling of 211531245542 in words is "two hundred eleven billion, five hundred thirty-one million, two hundred forty-five thousand, five hundred forty-two".