21033401152 has 56 divisors (see below), whose sum is σ = 42771624896. Its totient is φ = 10257020928.

The previous prime is 21033401149. The next prime is 21033401153. The reversal of 21033401152 is 25110433012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033401153) 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, 1995448 + ... + 2005960.

It is an arithmetic number, because the mean of its divisors is an integer number (763779016).

Almost surely, 2^21033401152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21033401152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21385812448).

21033401152 is an abundant number, since it is smaller than the sum of its proper divisors (21738223744).

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

21033401152 is a wasteful number, since it uses less digits than its factorization.

21033401152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11295 (or 11285 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21033401152 its reverse (25110433012), we get a palindrome (46143834164).

The spelling of 21033401152 in words is "twenty-one billion, thirty-three million, four hundred one thousand, one hundred fifty-two".