21470075 has 24 divisors (see below), whose sum is σ = 29368656. Its totient is φ = 15440000.

The previous prime is 21470069. The next prime is 21470081. The reversal of 21470075 is 57007412.

It is an interprime number because it is at equal distance from previous prime (21470069) and next prime (21470081).

It is not a de Polignac number, because 21470075 - 2¹² = 21465979 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27389 + ... + 28161.

It is an arithmetic number, because the mean of its divisors is an integer number (1223694).

Almost surely, 2^21470075 is an apocalyptic number.

21470075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21470075 is a deficient number, since it is larger than the sum of its proper divisors (7898581).

21470075 is a wasteful number, since it uses less digits than its factorization.

21470075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 890 counting only the distinct ones).

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

The square root of 21470075 is about 4633.5812283805. The cubic root of 21470075 is about 277.9358192505.

Adding to 21470075 its reverse (57007412), we get a palindrome (78477487).

The spelling of 21470075 in words is "twenty-one million, four hundred seventy thousand, seventy-five".