21827190 has 96 divisors (see below), whose sum is σ = 65882880. Its totient is φ = 4530240.

The previous prime is 21827177. The next prime is 21827191. The reversal of 21827190 is 9172812.

It is a super-2 number, since 2×21827190² = 952852446592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21827191) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 24981 + ... + 25839.

It is an arithmetic number, because the mean of its divisors is an integer number (686280).

Almost surely, 2^21827190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21827190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32941440).

21827190 is an abundant number, since it is smaller than the sum of its proper divisors (44055690).

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

21827190 is a wasteful number, since it uses less digits than its factorization.

21827190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21827190 is about 4671.9578337138. The cubic root of 21827190 is about 279.4683363548.

The spelling of 21827190 in words is "twenty-one million, eight hundred twenty-seven thousand, one hundred ninety".