400212101543125 has 10 divisors (see below), whose sum is σ = 500105042089070. Its totient is φ = 320169681234000.

The previous prime is 400212101543123. The next prime is 400212101543129. The reversal of 400212101543125 is 521345101212004.

It can be written as a sum of positive squares in 5 ways, for example, as 38266917672676 + 361945183870449 = 6186026^2 + 19024857^2 .

It is not a de Polignac number, because 400212101543125 - 2¹ = 400212101543123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400212101543123) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 320169680610 + ... + 320169681859.

It is an arithmetic number, because the mean of its divisors is an integer number (50010504208907).

Almost surely, 2^{400212101543125} is an apocalyptic number.

It is an amenable number.

400212101543125 is a deficient number, since it is larger than the sum of its proper divisors (99892940545945).

400212101543125 is an frugal number, since it uses more digits than its factorization.

400212101543125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640339362489 (or 640339362474 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 400212101543125 its reverse (521345101212004), we get a palindrome (921557202755129).

The spelling of 400212101543125 in words is "four hundred trillion, two hundred twelve billion, one hundred one million, five hundred forty-three thousand, one hundred twenty-five".