21530842252272 has 120 divisors (see below), whose sum is σ = 62616492871296. Its totient is φ = 7162209729216.

The previous prime is 21530842252261. The next prime is 21530842252273. The reversal of 21530842252272 is 27225224803512.

21530842252272 is a `hidden beast` number, since 2 + 1 + 5 + 30 + 8 + 4 + 22 + 522 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530842252273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3792138 + ... + 7579049.

Almost surely, 2^{21530842252272} is an apocalyptic number.

It is an amenable number.

21530842252272 is an abundant number, since it is smaller than the sum of its proper divisors (41085650619024).

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

21530842252272 is a wasteful number, since it uses less digits than its factorization.

21530842252272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11371697 (or 11371679 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 45.

The spelling of 21530842252272 in words is "twenty-one trillion, five hundred thirty billion, eight hundred forty-two million, two hundred fifty-two thousand, two hundred seventy-two".