21152018474132 has 72 divisors (see below), whose sum is σ = 45810808739136. Its totient is φ = 8367412195584.

The previous prime is 21152018474101. The next prime is 21152018474189. The reversal of 21152018474132 is 23147481025112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152018474132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104698688 + ... + 104900520.

It is an arithmetic number, because the mean of its divisors is an integer number (636261232488).

Almost surely, 2^{21152018474132} is an apocalyptic number.

It is an amenable number.

21152018474132 is an abundant number, since it is smaller than the sum of its proper divisors (24658790265004).

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

21152018474132 is a wasteful number, since it uses less digits than its factorization.

21152018474132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224017 (or 224002 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

Adding to 21152018474132 its reverse (23147481025112), we get a palindrome (44299499499244).

The spelling of 21152018474132 in words is "twenty-one trillion, one hundred fifty-two billion, eighteen million, four hundred seventy-four thousand, one hundred thirty-two".