21021011043444 has 48 divisors (see below), whose sum is σ = 54504753264640. Its totient is φ = 7006253371200.

The previous prime is 21021011043433. The next prime is 21021011043451. The reversal of 21021011043444 is 44434011012012.

21021011043444 is a `hidden beast` number, since 2 + 1 + 0 + 210 + 1 + 1 + 0 + 4 + 3 + 444 = 666.

It is a super-2 number, since 2×21021011043444² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9407257 + ... + 11425344.

Almost surely, 2^{21021011043444} is an apocalyptic number.

It is an amenable number.

21021011043444 is an abundant number, since it is smaller than the sum of its proper divisors (33483742221196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021011043444 is a wasteful number, since it uses less digits than its factorization.

21021011043444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20841957 (or 20841949 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

Adding to 21021011043444 its reverse (44434011012012), we get a palindrome (65455022055456).

The spelling of 21021011043444 in words is "twenty-one trillion, twenty-one billion, eleven million, forty-three thousand, four hundred forty-four".