21437443444 has 12 divisors (see below), whose sum is σ = 37518007744. Its totient is φ = 10718012664.

The previous prime is 21437443427. The next prime is 21437443463. The reversal of 21437443444 is 44434473412.

It is a super-2 number, since 2×21437443444² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21437443397 and 21437443406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106062 + ... + 232645.

Almost surely, 2^21437443444 is an apocalyptic number.

It is an amenable number.

21437443444 is a deficient number, since it is larger than the sum of its proper divisors (16080564300).

21437443444 is a wasteful number, since it uses less digits than its factorization.

21437443444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354534 (or 354532 counting only the distinct ones).

The product of its digits is 516096, while the sum is 40.

The spelling of 21437443444 in words is "twenty-one billion, four hundred thirty-seven million, four hundred forty-three thousand, four hundred forty-four".