21026443244 has 24 divisors (see below), whose sum is σ = 36897530208. Its totient is φ = 10484328960.

The previous prime is 21026443231. The next prime is 21026443261. The reversal of 21026443244 is 44234462012.

It is a super-2 number, since 2×21026443244² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21026443244.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2815964 + ... + 2823420.

It is an arithmetic number, because the mean of its divisors is an integer number (1537397092).

Almost surely, 2^21026443244 is an apocalyptic number.

It is an amenable number.

21026443244 is a deficient number, since it is larger than the sum of its proper divisors (15871086964).

21026443244 is a wasteful number, since it uses less digits than its factorization.

21026443244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9305 (or 9303 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

The spelling of 21026443244 in words is "twenty-one billion, twenty-six million, four hundred forty-three thousand, two hundred forty-four".