21045033042 has 64 divisors (see below), whose sum is σ = 48449111040. Its totient is φ = 6027134400.

The previous prime is 21045033013. The next prime is 21045033047. The reversal of 21045033042 is 24033054012.

It is not an unprimeable number, because it can be changed into a prime (21045033047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508003 + ... + 547865.

It is an arithmetic number, because the mean of its divisors is an integer number (757017360).

Almost surely, 2^21045033042 is an apocalyptic number.

21045033042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21045033042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24224555520).

21045033042 is an abundant number, since it is smaller than the sum of its proper divisors (27404077998).

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

21045033042 is a wasteful number, since it uses less digits than its factorization.

21045033042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40319.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21045033042 its reverse (24033054012), we get a palindrome (45078087054).

The spelling of 21045033042 in words is "twenty-one billion, forty-five million, thirty-three thousand, forty-two".