21354354000 has 480 divisors, whose sum is σ = 88409508096. Its totient is φ = 4880217600.

The previous prime is 21354353987. The next prime is 21354354001. The reversal of 21354354000 is 45345312.

21354354000 is a `hidden beast` number, since 213 + 5 + 43 + 5 + 400 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354354001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3398862 + ... + 3405138.

Almost surely, 2^21354354000 is an apocalyptic number.

21354354000 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 21354354000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44204754048).

21354354000 is an abundant number, since it is smaller than the sum of its proper divisors (67055154096).

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

21354354000 is an equidigital number, since it uses as much as digits as its factorization.

21354354000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322 (or 6294 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21354354000 its reverse (45345312), we get a palindrome (21399699312).

The spelling of 21354354000 in words is "twenty-one billion, three hundred fifty-four million, three hundred fifty-four thousand".