21231401312 has 24 divisors (see below), whose sum is σ = 45599260392. Its totient is φ = 9650636800.

The previous prime is 21231401311. The next prime is 21231401333. The reversal of 21231401312 is 21310413212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231401311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30157889 + ... + 30158592.

It is an arithmetic number, because the mean of its divisors is an integer number (1899969183).

Almost surely, 2^21231401312 is an apocalyptic number.

21231401312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21231401312 is an abundant number, since it is smaller than the sum of its proper divisors (24367859080).

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

21231401312 is a wasteful number, since it uses less digits than its factorization.

21231401312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60316502 (or 60316494 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21231401312 its reverse (21310413212), we get a palindrome (42541814524).

The spelling of 21231401312 in words is "twenty-one billion, two hundred thirty-one million, four hundred one thousand, three hundred twelve".