21321340000 has 60 divisors (see below), whose sum is σ = 52453743804. Its totient is φ = 8528528000.

The previous prime is 21321339979. The next prime is 21321340037. The reversal of 21321340000 is 4312312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 513034 + ... + 553033.

Almost surely, 2^21321340000 is an apocalyptic number.

21321340000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321340000 is an abundant number, since it is smaller than the sum of its proper divisors (31132403804).

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

21321340000 is an equidigital number, since it uses as much as digits as its factorization.

21321340000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066097 (or 1066074 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21321340000 its reverse (4312312), we get a palindrome (21325652312).

The spelling of 21321340000 in words is "twenty-one billion, three hundred twenty-one million, three hundred forty thousand".