21754141 has 2 divisors, whose sum is σ = 21754142. Its totient is φ = 21754140.

The previous prime is 21754121. The next prime is 21754153. The reversal of 21754141 is 14145712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 3048516 = 4325^2 + 1746^2 .

It is a cyclic number.

It is not a de Polignac number, because 21754141 - 2⁷ = 21754013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21754121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10877070 + 10877071.

It is an arithmetic number, because the mean of its divisors is an integer number (10877071).

Almost surely, 2^21754141 is an apocalyptic number.

It is an amenable number.

21754141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21754141 is an equidigital number, since it uses as much as digits as its factorization.

21754141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 25.

The square root of 21754141 is about 4664.1334672155. The cubic root of 21754141 is about 279.1562225939.

Adding to 21754141 its reverse (14145712), we get a palindrome (35899853).

The spelling of 21754141 in words is "twenty-one million, seven hundred fifty-four thousand, one hundred forty-one".