21354030 has 80 divisors (see below), whose sum is σ = 58910544. Its totient is φ = 5546880.

The previous prime is 21354019. The next prime is 21354049. The reversal of 21354030 is 3045312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21353994 and 21354012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32889 + ... + 33531.

Almost surely, 2^21354030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21354030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29455272).

21354030 is an abundant number, since it is smaller than the sum of its proper divisors (37556514).

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

21354030 is a wasteful number, since it uses less digits than its factorization.

21354030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21354030 is about 4621.0420902649. The cubic root of 21354030 is about 277.4341699215.

Adding to 21354030 its reverse (3045312), we get a palindrome (24399342).

The spelling of 21354030 in words is "twenty-one million, three hundred fifty-four thousand, thirty".