21044436412 has 6 divisors (see below), whose sum is σ = 36827763728. Its totient is φ = 10522218204.

The previous prime is 21044436407. The next prime is 21044436509. The reversal of 21044436412 is 21463444012.

It is a super-2 number, since 2×21044436412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 2630554548 + ... + 2630554555.

Almost surely, 2^21044436412 is an apocalyptic number.

It is an amenable number.

21044436412 is a deficient number, since it is larger than the sum of its proper divisors (15783327316).

21044436412 is a wasteful number, since it uses less digits than its factorization.

21044436412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261109107 (or 5261109105 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The spelling of 21044436412 in words is "twenty-one billion, forty-four million, four hundred thirty-six thousand, four hundred twelve".