21321103412 has 48 divisors (see below), whose sum is σ = 43575447552. Its totient is φ = 8939777760.

The previous prime is 21321103393. The next prime is 21321103423. The reversal of 21321103412 is 21430112312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194837 + ... + 283907.

It is an arithmetic number, because the mean of its divisors is an integer number (907821824).

Almost surely, 2^21321103412 is an apocalyptic number.

It is an amenable number.

21321103412 is an abundant number, since it is smaller than the sum of its proper divisors (22254344140).

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

21321103412 is a wasteful number, since it uses less digits than its factorization.

21321103412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89268 (or 89266 counting only the distinct ones).

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

Adding to 21321103412 its reverse (21430112312), we get a palindrome (42751215724).

The spelling of 21321103412 in words is "twenty-one billion, three hundred twenty-one million, one hundred three thousand, four hundred twelve".