21415741 has 2 divisors, whose sum is σ = 21415742. Its totient is φ = 21415740.

The previous prime is 21415727. The next prime is 21415753. The reversal of 21415741 is 14751412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 2493241 = 4350^2 + 1579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21415741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21415721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707870 + 10707871.

It is an arithmetic number, because the mean of its divisors is an integer number (10707871).

Almost surely, 2^21415741 is an apocalyptic number.

It is an amenable number.

21415741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21415741 is an equidigital number, since it uses as much as digits as its factorization.

21415741 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 21415741 is about 4627.7144466788. The cubic root of 21415741 is about 277.7011651770.

The spelling of 21415741 in words is "twenty-one million, four hundred fifteen thousand, seven hundred forty-one".