21754933 has 4 divisors (see below), whose sum is σ = 21875308. Its totient is φ = 21634560.

The previous prime is 21754891. The next prime is 21754961. The reversal of 21754933 is 33945712.

21754933 = T₃₉₇ + T₃₉₈ + ... + T₅₇₇.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1306449 + 20448484 = 1143^2 + 4522^2 .

It is a cyclic number.

It is not a de Polignac number, because 21754933 - 2¹³ = 21746741 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 (21754633) 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, 59916 + ... + 60277.

It is an arithmetic number, because the mean of its divisors is an integer number (5468827).

Almost surely, 2^21754933 is an apocalyptic number.

It is an amenable number.

21754933 is a deficient number, since it is larger than the sum of its proper divisors (120375).

21754933 is a wasteful number, since it uses less digits than its factorization.

21754933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120374.

The product of its digits is 22680, while the sum is 34.

The square root of 21754933 is about 4664.2183696735. The cubic root of 21754933 is about 279.1596102867.

The spelling of 21754933 in words is "twenty-one million, seven hundred fifty-four thousand, nine hundred thirty-three".