21475007 has 8 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 21179224.

The previous prime is 21475001. The next prime is 21475019. The reversal of 21475007 is 70057412.

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

It is a cyclic number.

It is not a de Polignac number, because 21475007 - 2⁴ = 21474991 is a prime.

It is a super-2 number, since 2×21475007² = 922351851300098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44594 + ... + 45072.

It is an arithmetic number, because the mean of its divisors is an integer number (2721600).

Almost surely, 2^21475007 is an apocalyptic number.

21475007 is a deficient number, since it is larger than the sum of its proper divisors (297793).

21475007 is a wasteful number, since it uses less digits than its factorization.

21475007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005.

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

The square root of 21475007 is about 4634.1133995620. The cubic root of 21475007 is about 277.9570996375.

The spelling of 21475007 in words is "twenty-one million, four hundred seventy-five thousand, seven".