21421400312 has 32 divisors (see below), whose sum is σ = 43510731600. Its totient is φ = 9886792032.

The previous prime is 21421400311. The next prime is 21421400323. The reversal of 21421400312 is 21300412412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421400311) 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, 591818 + ... + 626969.

Almost surely, 2^21421400312 is an apocalyptic number.

It is an amenable number.

21421400312 is an abundant number, since it is smaller than the sum of its proper divisors (22089331288).

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

21421400312 is a wasteful number, since it uses less digits than its factorization.

21421400312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218832 (or 1218802 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21421400312 its reverse (21300412412), we get a palindrome (42721812724).

The spelling of 21421400312 in words is "twenty-one billion, four hundred twenty-one million, four hundred thousand, three hundred twelve".