21475700 has 72 divisors (see below), whose sum is σ = 49996800. Its totient is φ = 7983360.

The previous prime is 21475697. The next prime is 21475717. The reversal of 21475700 is 757412.

It is a super-2 number, since 2×21475700² = 922411380980000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21475700.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 169037 + ... + 169163.

It is an arithmetic number, because the mean of its divisors is an integer number (694400).

Almost surely, 2^21475700 is an apocalyptic number.

21475700 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 21475700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24998400).

21475700 is an abundant number, since it is smaller than the sum of its proper divisors (28521100).

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

21475700 is a wasteful number, since it uses less digits than its factorization.

21475700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21475700 is about 4634.1881705429. The cubic root of 21475700 is about 277.9600895038.

The spelling of 21475700 in words is "twenty-one million, four hundred seventy-five thousand, seven hundred".