21477852 has 96 divisors (see below), whose sum is σ = 61689600. Its totient is φ = 6408000.

The previous prime is 21477811. The next prime is 21477853. The reversal of 21477852 is 25877412.

It is a super-2 number, since 2×21477852² = 922596253067808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119899 + ... + 120077.

It is an arithmetic number, because the mean of its divisors is an integer number (642600).

Almost surely, 2^21477852 is an apocalyptic number.

21477852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21477852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30844800).

21477852 is an abundant number, since it is smaller than the sum of its proper divisors (40211748).

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

21477852 is a wasteful number, since it uses less digits than its factorization.

21477852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 296 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 21477852 is about 4634.4203521045. The cubic root of 21477852 is about 277.9693736425.

It can be divided in two parts, 2147 and 7852, that added together give a palindrome (9999).

The spelling of 21477852 in words is "twenty-one million, four hundred seventy-seven thousand, eight hundred fifty-two".