210442522123 has 4 divisors (see below), whose sum is σ = 221518444360. Its totient is φ = 199366599888.

The previous prime is 210442522111. The next prime is 210442522139. The reversal of 210442522123 is 321225244012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210442522123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210442522091 and 210442522100.

It is not an unprimeable number, because it can be changed into a prime (210442522183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5537961090 + ... + 5537961127.

It is an arithmetic number, because the mean of its divisors is an integer number (55379611090).

Almost surely, 2^210442522123 is an apocalyptic number.

210442522123 is a deficient number, since it is larger than the sum of its proper divisors (11075922237).

210442522123 is a wasteful number, since it uses less digits than its factorization.

210442522123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11075922236.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 210442522123 its reverse (321225244012), we get a palindrome (531667766135).

The spelling of 210442522123 in words is "two hundred ten billion, four hundred forty-two million, five hundred twenty-two thousand, one hundred twenty-three".