101821811125 has 16 divisors (see below), whose sum is σ = 127125932544. Its totient is φ = 81423915600.

The previous prime is 101821811123. The next prime is 101821811149. The reversal of 101821811125 is 521118128101.

It is a happy number.

It is not a de Polignac number, because 101821811125 - 2¹ = 101821811123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101821811123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139432 + ... + 472318.

It is an arithmetic number, because the mean of its divisors is an integer number (7945370784).

Almost surely, 2^101821811125 is an apocalyptic number.

It is an amenable number.

101821811125 is a deficient number, since it is larger than the sum of its proper divisors (25304121419).

101821811125 is an equidigital number, since it uses as much as digits as its factorization.

101821811125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335349 (or 335339 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 31.

Adding to 101821811125 its reverse (521118128101), we get a palindrome (622939939226).

The spelling of 101821811125 in words is "one hundred one billion, eight hundred twenty-one million, eight hundred eleven thousand, one hundred twenty-five".