21033400044 has 24 divisors (see below), whose sum is σ = 49085270640. Its totient is φ = 7010085184.

The previous prime is 21033399977. The next prime is 21033400049. The reversal of 21033400044 is 44000433012.

It is not an unprimeable number, because it can be changed into a prime (21033400049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45159 + ... + 210014.

It is an arithmetic number, because the mean of its divisors is an integer number (2045219610).

Almost surely, 2^21033400044 is an apocalyptic number.

It is an amenable number.

21033400044 is an abundant number, since it is smaller than the sum of its proper divisors (28051870596).

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

21033400044 is a wasteful number, since it uses less digits than its factorization.

21033400044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262049 (or 262047 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21033400044 its reverse (44000433012), we get a palindrome (65033833056).

The spelling of 21033400044 in words is "twenty-one billion, thirty-three million, four hundred thousand, forty-four".