21325047 has 4 divisors (see below), whose sum is σ = 28433400. Its totient is φ = 14216696.

The previous prime is 21325037. The next prime is 21325093. The reversal of 21325047 is 74052312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21325047 - 2⁶ = 21324983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554172 + ... + 3554177.

It is an arithmetic number, because the mean of its divisors is an integer number (7108350).

Almost surely, 2^21325047 is an apocalyptic number.

21325047 is a deficient number, since it is larger than the sum of its proper divisors (7108353).

21325047 is an equidigital number, since it uses as much as digits as its factorization.

21325047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108352.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21325047 is about 4617.9050444980. The cubic root of 21325047 is about 277.3085961985.

Adding to 21325047 its reverse (74052312), we get a palindrome (95377359).

It can be divided in two parts, 213 and 25047, that multiplied together give a triangular number (5335011 = T₃₂₆₆).

The spelling of 21325047 in words is "twenty-one million, three hundred twenty-five thousand, forty-seven".