21475442 has 8 divisors (see below), whose sum is σ = 32245356. Its totient is φ = 10726992.

The previous prime is 21475417. The next prime is 21475451. The reversal of 21475442 is 24457412.

It can be written as a sum of positive squares in 2 ways, for example, as 21353641 + 121801 = 4621^2 + 349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21475442² = 922389218190728, which contains 22 as substring.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 7040.

Almost surely, 2^21475442 is an apocalyptic number.

21475442 is a deficient number, since it is larger than the sum of its proper divisors (10769914).

21475442 is a wasteful number, since it uses less digits than its factorization.

21475442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10732.

The product of its digits is 8960, while the sum is 29.

The square root of 21475442 is about 4634.1603338685. The cubic root of 21475442 is about 277.9589764009.

The spelling of 21475442 in words is "twenty-one million, four hundred seventy-five thousand, four hundred forty-two".