21001131312 has 40 divisors (see below), whose sum is σ = 62003341056. Its totient is φ = 6000323136.

The previous prime is 21001131311. The next prime is 21001131383. The reversal of 21001131312 is 21313110012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001131291 and 21001131300.

It is not an unprimeable number, because it can be changed into a prime (21001131311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31251348 + ... + 31252019.

Almost surely, 2^21001131312 is an apocalyptic number.

It is an amenable number.

21001131312 is an abundant number, since it is smaller than the sum of its proper divisors (41002209744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001131312 is a wasteful number, since it uses less digits than its factorization.

21001131312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62503385 (or 62503379 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21001131312 its reverse (21313110012), we get a palindrome (42314241324).

The spelling of 21001131312 in words is "twenty-one billion, one million, one hundred thirty-one thousand, three hundred twelve".