21471217412 has 6 divisors (see below), whose sum is σ = 37574630478. Its totient is φ = 10735608704.

The previous prime is 21471217357. The next prime is 21471217421.

21471217412 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 20037534916 + 1433682496 = 141554^2 + 37864^2 .

It is a super-2 number, since 2×21471217412² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2683902173 + ... + 2683902180.

It is an arithmetic number, because the mean of its divisors is an integer number (6262438413).

Almost surely, 2^21471217412 is an apocalyptic number.

It is an amenable number.

21471217412 is a deficient number, since it is larger than the sum of its proper divisors (16103413066).

21471217412 is a wasteful number, since it uses less digits than its factorization.

21471217412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367804357 (or 5367804355 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The spelling of 21471217412 in words is "twenty-one billion, four hundred seventy-one million, two hundred seventeen thousand, four hundred twelve".