21734417 has 2 divisors, whose sum is σ = 21734418. Its totient is φ = 21734416.

The previous prime is 21734411. The next prime is 21734431. The reversal of 21734417 is 71443712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 1985281 = 4444^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 21734417 - 2¹² = 21730321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21734417.

It is not a weakly prime, because it can be changed into another prime (21734411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867208 + 10867209.

It is an arithmetic number, because the mean of its divisors is an integer number (10867209).

Almost surely, 2^21734417 is an apocalyptic number.

It is an amenable number.

21734417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734417 is an equidigital number, since it uses as much as digits as its factorization.

21734417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 21734417 is about 4662.0185542316. The cubic root of 21734417 is about 279.0718288187.

The spelling of 21734417 in words is "twenty-one million, seven hundred thirty-four thousand, four hundred seventeen".