21406010212 has 6 divisors (see below), whose sum is σ = 37460517878. Its totient is φ = 10703005104.

The previous prime is 21406010191. The next prime is 21406010221. The reversal of 21406010212 is 21201060412.

It can be written as a sum of positive squares in only one way, i.e., 16464482596 + 4941527616 = 128314^2 + 70296^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21406010212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675751273 + ... + 2675751280.

Almost surely, 2^21406010212 is an apocalyptic number.

It is an amenable number.

21406010212 is a deficient number, since it is larger than the sum of its proper divisors (16054507666).

21406010212 is a wasteful number, since it uses less digits than its factorization.

21406010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351502557 (or 5351502555 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21406010212 its reverse (21201060412), we get a palindrome (42607070624).

The spelling of 21406010212 in words is "twenty-one billion, four hundred six million, ten thousand, two hundred twelve".