211515125325542 has 4 divisors (see below), whose sum is σ = 317272687988316. Its totient is φ = 105757562662770.

The previous prime is 211515125325541. The next prime is 211515125325653. The reversal of 211515125325542 is 245523521515112.

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

It is a junction number, because it is equal to n+sod(n) for n = 211515125325493 and 211515125325502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211515125325541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52878781331384 + ... + 52878781331387.

It is an arithmetic number, because the mean of its divisors is an integer number (79318171997079).

Almost surely, 2^{211515125325542} is an apocalyptic number.

211515125325542 is a deficient number, since it is larger than the sum of its proper divisors (105757562662774).

211515125325542 is a wasteful number, since it uses less digits than its factorization.

211515125325542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105757562662773.

The product of its digits is 600000, while the sum is 44.

The spelling of 211515125325542 in words is "two hundred eleven trillion, five hundred fifteen billion, one hundred twenty-five million, three hundred twenty-five thousand, five hundred forty-two".