21472117 has 2 divisors, whose sum is σ = 21472118. Its totient is φ = 21472116.

The previous prime is 21472111. The next prime is 21472123. The reversal of 21472117 is 71127412.

It is a balanced prime because it is at equal distance from previous prime (21472111) and next prime (21472123).

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 1347921 = 4486^2 + 1161^2 .

It is a cyclic number.

It is not a de Polignac number, because 21472117 - 2¹¹ = 21470069 is a prime.

It is a super-2 number, since 2×21472117² = 922103616923378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21472091 and 21472100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21472111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736058 + 10736059.

It is an arithmetic number, because the mean of its divisors is an integer number (10736059).

Almost surely, 2^21472117 is an apocalyptic number.

It is an amenable number.

21472117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472117 is an equidigital number, since it uses as much as digits as its factorization.

21472117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 784, while the sum is 25.

The square root of 21472117 is about 4633.8015710645. The cubic root of 21472117 is about 277.9446303819.

Adding to 21472117 its reverse (71127412), we get a palindrome (92599529).

The spelling of 21472117 in words is "twenty-one million, four hundred seventy-two thousand, one hundred seventeen".