21263432612 has 6 divisors (see below), whose sum is σ = 37211007078. Its totient is φ = 10631716304.

The previous prime is 21263432599. The next prime is 21263432623. The reversal of 21263432612 is 21623436212.

It can be written as a sum of positive squares in only one way, i.e., 20731392256 + 532040356 = 143984^2 + 23066^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2657929073 + ... + 2657929080.

It is an arithmetic number, because the mean of its divisors is an integer number (6201834513).

Almost surely, 2^21263432612 is an apocalyptic number.

It is an amenable number.

21263432612 is a deficient number, since it is larger than the sum of its proper divisors (15947574466).

21263432612 is a wasteful number, since it uses less digits than its factorization.

21263432612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315858157 (or 5315858155 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

Adding to 21263432612 its reverse (21623436212), we get a palindrome (42886868824).

The spelling of 21263432612 in words is "twenty-one billion, two hundred sixty-three million, four hundred thirty-two thousand, six hundred twelve".