21154000 has 80 divisors (see below), whose sum is σ = 58496256. Its totient is φ = 7248000.

The previous prime is 21153971. The next prime is 21154019. The reversal of 21154000 is 45112.

It is a tau number, because it is divible by the number of its divisors (80).

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, 13245 + ... + 14755.

Almost surely, 2^21154000 is an apocalyptic number.

21154000 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 21154000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29248128).

21154000 is an abundant number, since it is smaller than the sum of its proper divisors (37342256).

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

21154000 is a wasteful number, since it uses less digits than its factorization.

21154000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 21154000 is about 4599.3477798488. The cubic root of 21154000 is about 276.5651794669.

Adding to 21154000 its reverse (45112), we get a palindrome (21199112).

The spelling of 21154000 in words is "twenty-one million, one hundred fifty-four thousand".