21354350 has 48 divisors (see below), whose sum is σ = 42854400. Its totient is φ = 7893600.

The previous prime is 21354349. The next prime is 21354391. The reversal of 21354350 is 5345312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35351 + ... + 35949.

It is an arithmetic number, because the mean of its divisors is an integer number (892800).

Almost surely, 2^21354350 is an apocalyptic number.

21354350 is an abundant number, since it is smaller than the sum of its proper divisors (21500050).

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

21354350 is a wasteful number, since it uses less digits than its factorization.

21354350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21354350 is about 4621.0767143600. The cubic root of 21354350 is about 277.4355557410.

Adding to 21354350 its reverse (5345312), we get a palindrome (26699662).

The spelling of 21354350 in words is "twenty-one million, three hundred fifty-four thousand, three hundred fifty".