21472000 has 144 divisors (see below), whose sum is σ = 59308704. Its totient is φ = 7680000.

The previous prime is 21471991. The next prime is 21472021. The reversal of 21472000 is 27412.

It is a super-2 number, since 2×21472000² = 922093568000000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351970 + ... + 352030.

It is an arithmetic number, because the mean of its divisors is an integer number (411866).

Almost surely, 2^21472000 is an apocalyptic number.

21472000 is a gapful number since it is divisible by the number (20) 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 21472000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29654352).

21472000 is an abundant number, since it is smaller than the sum of its proper divisors (37836704).

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

21472000 is an equidigital number, since it uses as much as digits as its factorization.

21472000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21472000 is about 4633.7889464239. The cubic root of 21472000 is about 277.9441255476.

Adding to 21472000 its reverse (27412), we get a palindrome (21499412).

The spelling of 21472000 in words is "twenty-one million, four hundred seventy-two thousand".