21248077 has 8 divisors (see below), whose sum is σ = 21738240. Its totient is φ = 20763600.

The previous prime is 21248057. The next prime is 21248081. The reversal of 21248077 is 77084212.

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 21248077 - 2¹⁵ = 21215309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21248047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6648 + ... + 9310.

It is an arithmetic number, because the mean of its divisors is an integer number (2717280).

Almost surely, 2^21248077 is an apocalyptic number.

It is an amenable number.

21248077 is a deficient number, since it is larger than the sum of its proper divisors (490163).

21248077 is a wasteful number, since it uses less digits than its factorization.

21248077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2843.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 21248077 is about 4609.5636452923. The cubic root of 21248077 is about 276.9745574776.

It can be divided in two parts, 2124 and 8077, that added together give a palindrome (10201).

The spelling of 21248077 in words is "twenty-one million, two hundred forty-eight thousand, seventy-seven".