315402232231021 has 16 divisors (see below), whose sum is σ = 351582096423600. Its totient is φ = 280936710286848.

The previous prime is 315402232231001. The next prime is 315402232231081. The reversal of 315402232231021 is 120132232204513.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 39263883888100 + 276138348342921 = 6266090^2 + 16617411^2 .

It is not a de Polignac number, because 315402232231021 - 2¹¹ = 315402232228973 is a prime.

It is a super-3 number, since 3×315402232231021³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315402232231001) 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, 244121856 + ... + 245410441.

It is an arithmetic number, because the mean of its divisors is an integer number (21973881026475).

Almost surely, 2^{315402232231021} is an apocalyptic number.

It is an amenable number.

315402232231021 is a deficient number, since it is larger than the sum of its proper divisors (36179864192579).

315402232231021 is a wasteful number, since it uses less digits than its factorization.

315402232231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489534048.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 315402232231021 its reverse (120132232204513), we get a palindrome (435534464435534).

The spelling of 315402232231021 in words is "three hundred fifteen trillion, four hundred two billion, two hundred thirty-two million, two hundred thirty-one thousand, twenty-one".