21552433030144 has 22 divisors (see below), whose sum is σ = 43083818764454. Its totient is φ = 10776216514560.

The previous prime is 21552433030123. The next prime is 21552433030189. The reversal of 21552433030144 is 44103033425512.

It can be written as a sum of positive squares in only one way, i.e., 18300325740544 + 3252107289600 = 4277888^2 + 1803360^2 .

It is a super-2 number, since 2×21552433030144² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10523647917 + ... + 10523649964.

Almost surely, 2^{21552433030144} is an apocalyptic number.

It is an amenable number.

21552433030144 is a deficient number, since it is larger than the sum of its proper divisors (21531385734310).

21552433030144 is an equidigital number, since it uses as much as digits as its factorization.

21552433030144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21047297901 (or 21047297883 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21552433030144 its reverse (44103033425512), we get a palindrome (65655466455656).

The spelling of 21552433030144 in words is "twenty-one trillion, five hundred fifty-two billion, four hundred thirty-three million, thirty thousand, one hundred forty-four".