21475941 has 8 divisors (see below), whose sum is σ = 29120160. Its totient is φ = 14074512.

The previous prime is 21475939. The next prime is 21475957. The reversal of 21475941 is 14957412.

It is a happy number.

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

It is not a de Polignac number, because 21475941 - 2¹ = 21475939 is a prime.

It is a super-2 number, since 2×21475941² = 922432083670962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475241) 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 7 ways as a sum of consecutive naturals, for example, 60490 + ... + 60843.

It is an arithmetic number, because the mean of its divisors is an integer number (3640020).

Almost surely, 2^21475941 is an apocalyptic number.

It is an amenable number.

21475941 is a deficient number, since it is larger than the sum of its proper divisors (7644219).

21475941 is a wasteful number, since it uses less digits than its factorization.

21475941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121395.

The product of its digits is 10080, while the sum is 33.

The square root of 21475941 is about 4634.2141728669. The cubic root of 21475941 is about 277.9611292546.

The spelling of 21475941 in words is "twenty-one million, four hundred seventy-five thousand, nine hundred forty-one".