21272031360 has 192 divisors, whose sum is σ = 75825135360. Its totient is φ = 5489510400.

The previous prime is 21272031331. The next prime is 21272031373. The reversal of 21272031360 is 6313027212.

21272031360 is a `hidden beast` number, since 2 + 1 + 272 + 0 + 31 + 360 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

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, 118995 + ... + 238125.

It is an arithmetic number, because the mean of its divisors is an integer number (394922580).

Almost surely, 2^21272031360 is an apocalyptic number.

21272031360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21272031360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37912567680).

21272031360 is an abundant number, since it is smaller than the sum of its proper divisors (54553104000).

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

21272031360 is a wasteful number, since it uses less digits than its factorization.

21272031360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119187 (or 119172 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

Adding to 21272031360 its reverse (6313027212), we get a palindrome (27585058572).

The spelling of 21272031360 in words is "twenty-one billion, two hundred seventy-two million, thirty-one thousand, three hundred sixty".