21424155004340 has 192 divisors, whose sum is σ = 52878327828480. Its totient is φ = 7204014704640.

The previous prime is 21424155004337. The next prime is 21424155004361. The reversal of 21424155004340 is 4340055142412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21424155004340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 407532737 + ... + 407585303.

It is an arithmetic number, because the mean of its divisors is an integer number (275407957440).

Almost surely, 2^{21424155004340} is an apocalyptic number.

21424155004340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21424155004340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26439163914240).

21424155004340 is an abundant number, since it is smaller than the sum of its proper divisors (31454172824140).

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

21424155004340 is a wasteful number, since it uses less digits than its factorization.

21424155004340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54510 (or 54508 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

The spelling of 21424155004340 in words is "twenty-one trillion, four hundred twenty-four billion, one hundred fifty-five million, four thousand, three hundred forty".