21414155408 has 80 divisors (see below), whose sum is σ = 43946145600. Its totient is φ = 10093386240.

The previous prime is 21414155401. The next prime is 21414155443. The reversal of 21414155408 is 80455141412.

It is not an unprimeable number, because it can be changed into a prime (21414155401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3931535 + ... + 3936977.

It is an arithmetic number, because the mean of its divisors is an integer number (549326820).

Almost surely, 2^21414155408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21414155408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21973072800).

21414155408 is an abundant number, since it is smaller than the sum of its proper divisors (22531990192).

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

21414155408 is a wasteful number, since it uses less digits than its factorization.

21414155408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680 (or 5674 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The spelling of 21414155408 in words is "twenty-one billion, four hundred fourteen million, one hundred fifty-five thousand, four hundred eight".