125535312021 has 8 divisors (see below), whose sum is σ = 191291904064. Its totient is φ = 71734464000.

The previous prime is 125535312017. The next prime is 125535312047. The reversal of 125535312021 is 120213535521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125535312021 - 2² = 125535312017 is a prime.

It is a super-2 number, since 2×125535312021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125535312021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125535312421) 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, 2988935980 + ... + 2988936021.

It is an arithmetic number, because the mean of its divisors is an integer number (23911488008).

Almost surely, 2^125535312021 is an apocalyptic number.

It is an amenable number.

125535312021 is a deficient number, since it is larger than the sum of its proper divisors (65756592043).

125535312021 is an equidigital number, since it uses as much as digits as its factorization.

125535312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5977872011.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 125535312021 its reverse (120213535521), we get a palindrome (245748847542).

The spelling of 125535312021 in words is "one hundred twenty-five billion, five hundred thirty-five million, three hundred twelve thousand, twenty-one".