21740753 has 2 divisors, whose sum is σ = 21740754. Its totient is φ = 21740752.

The previous prime is 21740729. The next prime is 21740767. The reversal of 21740753 is 35704712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20367169 + 1373584 = 4513^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 21740753 - 2¹² = 21736657 is a prime.

It is a super-3 number, since 3×21740753³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21740353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870376 + 10870377.

It is an arithmetic number, because the mean of its divisors is an integer number (10870377).

Almost surely, 2^21740753 is an apocalyptic number.

It is an amenable number.

21740753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21740753 is an equidigital number, since it uses as much as digits as its factorization.

21740753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21740753 is about 4662.6980386896. The cubic root of 21740753 is about 279.0989444500.

The spelling of 21740753 in words is "twenty-one million, seven hundred forty thousand, seven hundred fifty-three".