21677741 has 2 divisors, whose sum is σ = 21677742. Its totient is φ = 21677740.

The previous prime is 21677723. The next prime is 21677779. The reversal of 21677741 is 14777612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14032516 + 7645225 = 3746^2 + 2765^2 .

It is a cyclic number.

It is not a de Polignac number, because 21677741 - 2¹⁴ = 21661357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21677701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838870 + 10838871.

It is an arithmetic number, because the mean of its divisors is an integer number (10838871).

Almost surely, 2^21677741 is an apocalyptic number.

It is an amenable number.

21677741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21677741 is an equidigital number, since it uses as much as digits as its factorization.

21677741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 35.

The square root of 21677741 is about 4655.9361035134. The cubic root of 21677741 is about 278.8290427174.

The spelling of 21677741 in words is "twenty-one million, six hundred seventy-seven thousand, seven hundred forty-one".