21312021301272 has 192 divisors, whose sum is σ = 63766053842400. Its totient is φ = 6388573317120.

The previous prime is 21312021301271. The next prime is 21312021301289. The reversal of 21312021301272 is 27210312021312.

It is a happy number.

21312021301272 is a `hidden beast` number, since 2 + 1 + 312 + 0 + 21 + 301 + 27 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312021301271) 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 47 ways as a sum of consecutive naturals, for example, 26816943 + ... + 27600225.

Almost surely, 2^{21312021301272} 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 21312021301272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31883026921200).

21312021301272 is an abundant number, since it is smaller than the sum of its proper divisors (42454032541128).

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

21312021301272 is a wasteful number, since it uses less digits than its factorization.

21312021301272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784058 (or 784051 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

Adding to 21312021301272 its reverse (27210312021312), we get a palindrome (48522333322584).

The spelling of 21312021301272 in words is "twenty-one trillion, three hundred twelve billion, twenty-one million, three hundred one thousand, two hundred seventy-two".