21340773 has 32 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 13662000.

The previous prime is 21340769. The next prime is 21340777. The reversal of 21340773 is 37704312.

It is an interprime number because it is at equal distance from previous prime (21340769) and next prime (21340777).

It is not a de Polignac number, because 21340773 - 2² = 21340769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84898 + ... + 85148.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^21340773 is an apocalyptic number.

It is an amenable number.

21340773 is a deficient number, since it is larger than the sum of its proper divisors (11560347).

21340773 is a wasteful number, since it uses less digits than its factorization.

21340773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 21340773 is about 4619.6074508555. The cubic root of 21340773 is about 277.3767458480.

The spelling of 21340773 in words is "twenty-one million, three hundred forty thousand, seven hundred seventy-three".