21471077 has 2 divisors, whose sum is σ = 21471078. Its totient is φ = 21471076.

The previous prime is 21471067. The next prime is 21471089. The reversal of 21471077 is 77017412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19307236 + 2163841 = 4394^2 + 1471^2 .

It is a cyclic number.

It is not a de Polignac number, because 21471077 - 2⁸ = 21470821 is a prime.

It is a super-2 number, since 2×21471077² = 922014295079858, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21471067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735538 + 10735539.

It is an arithmetic number, because the mean of its divisors is an integer number (10735539).

Almost surely, 2^21471077 is an apocalyptic number.

It is an amenable number.

21471077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21471077 is an equidigital number, since it uses as much as digits as its factorization.

21471077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 21471077 is about 4633.6893508305. The cubic root of 21471077 is about 277.9401429019.

Adding to 21471077 its reverse (77017412), we get a palindrome (98488489).

The spelling of 21471077 in words is "twenty-one million, four hundred seventy-one thousand, seventy-seven".