21152043012 has 48 divisors (see below), whose sum is σ = 51516122112. Its totient is φ = 6742100640.

The previous prime is 21152043001. The next prime is 21152043013. The reversal of 21152043012 is 21034025112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152043012.

It is not an unprimeable number, because it can be changed into a prime (21152043013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101937 + ... + 1120967.

It is an arithmetic number, because the mean of its divisors is an integer number (1073252544).

Almost surely, 2^21152043012 is an apocalyptic number.

It is an amenable number.

21152043012 is an abundant number, since it is smaller than the sum of its proper divisors (30364079100).

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

21152043012 is a wasteful number, since it uses less digits than its factorization.

21152043012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23088 (or 23086 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21152043012 its reverse (21034025112), we get a palindrome (42186068124).

The spelling of 21152043012 in words is "twenty-one billion, one hundred fifty-two million, forty-three thousand, twelve".