21112421340 has 48 divisors (see below), whose sum is σ = 59130156960. Its totient is φ = 5628514560.

The previous prime is 21112421339. The next prime is 21112421383. The reversal of 21112421340 is 4312421112.

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, 197506 + ... + 285014.

It is an arithmetic number, because the mean of its divisors is an integer number (1231878270).

Almost surely, 2^21112421340 is an apocalyptic number.

21112421340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112421340 is an abundant number, since it is smaller than the sum of its proper divisors (38017735620).

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

21112421340 is a wasteful number, since it uses less digits than its factorization.

21112421340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91542 (or 91540 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21112421340 its reverse (4312421112), we get a palindrome (25424842452).

The spelling of 21112421340 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-one thousand, three hundred forty".