21754097 has 2 divisors, whose sum is σ = 21754098. Its totient is φ = 21754096.

The previous prime is 21754079. The next prime is 21754121. The reversal of 21754097 is 79045712.

Together with previous prime (21754079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 1540081 = 4496^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 21754097 - 2¹⁰ = 21753073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21754027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10877048 + 10877049.

It is an arithmetic number, because the mean of its divisors is an integer number (10877049).

Almost surely, 2^21754097 is an apocalyptic number.

It is an amenable number.

21754097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21754097 is an equidigital number, since it uses as much as digits as its factorization.

21754097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 21754097 is about 4664.1287503670. The cubic root of 21754097 is about 279.1560343863.

The spelling of 21754097 in words is "twenty-one million, seven hundred fifty-four thousand, ninety-seven".