21088350 has 120 divisors (see below), whose sum is σ = 60496128. Its totient is φ = 5443200.

The previous prime is 21088343. The next prime is 21088351. The reversal of 21088350 is 5388012.

It is a happy number.

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 (21088351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 165987 + ... + 166113.

Almost surely, 2^21088350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21088350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30248064).

21088350 is an abundant number, since it is smaller than the sum of its proper divisors (39407778).

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

21088350 is a wasteful number, since it uses less digits than its factorization.

21088350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 21088350 is about 4592.2053525512. The cubic root of 21088350 is about 276.2787825842.

The spelling of 21088350 in words is "twenty-one million, eighty-eight thousand, three hundred fifty".