21593147 has 2 divisors, whose sum is σ = 21593148. Its totient is φ = 21593146.

The previous prime is 21593141. The next prime is 21593153. The reversal of 21593147 is 74139512.

It is a balanced prime because it is at equal distance from previous prime (21593141) and next prime (21593153).

It is a cyclic number.

It is not a de Polignac number, because 21593147 - 2⁶ = 21593083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21593141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10796573 + 10796574.

It is an arithmetic number, because the mean of its divisors is an integer number (10796574).

Almost surely, 2^21593147 is an apocalyptic number.

21593147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21593147 is an equidigital number, since it uses as much as digits as its factorization.

21593147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 21593147 is about 4646.8426915487. The cubic root of 21593147 is about 278.4658743012.

The spelling of 21593147 in words is "twenty-one million, five hundred ninety-three thousand, one hundred forty-seven".