21478496212 has 12 divisors (see below), whose sum is σ = 37974867700. Its totient is φ = 10628534016.

The previous prime is 21478496197. The next prime is 21478496213. The reversal of 21478496212 is 21269487412.

It can be written as a sum of positive squares in 2 ways, for example, as 5376408976 + 16102087236 = 73324^2 + 126894^2 .

It is a super-2 number, since 2×21478496212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478496213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27678087 + ... + 27678862.

Almost surely, 2^21478496212 is an apocalyptic number.

It is an amenable number.

21478496212 is a deficient number, since it is larger than the sum of its proper divisors (16496371488).

21478496212 is a wasteful number, since it uses less digits than its factorization.

21478496212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55357050 (or 55357048 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The spelling of 21478496212 in words is "twenty-one billion, four hundred seventy-eight million, four hundred ninety-six thousand, two hundred twelve".