21191352 has 128 divisors (see below), whose sum is σ = 67522560. Its totient is φ = 5391360.

The previous prime is 21191341. The next prime is 21191369. The reversal of 21191352 is 25319112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67548 + ... + 67860.

It is an arithmetic number, because the mean of its divisors is an integer number (527520).

Almost surely, 2^21191352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21191352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33761280).

21191352 is an abundant number, since it is smaller than the sum of its proper divisors (46331208).

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

21191352 is a wasteful number, since it uses less digits than its factorization.

21191352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 369 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 21191352 is about 4603.4065647084. The cubic root of 21191352 is about 276.7278624651.

The spelling of 21191352 in words is "twenty-one million, one hundred ninety-one thousand, three hundred fifty-two".