21361270172000 has 192 divisors, whose sum is σ = 57281041097280. Its totient is φ = 7764333568000.

The previous prime is 21361270171963. The next prime is 21361270172041. The reversal of 21361270172000 is 27107216312.

It is a super-2 number, since 2×21361270172000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101490872 + ... + 101701128.

It is an arithmetic number, because the mean of its divisors is an integer number (298338755715).

Almost surely, 2^{21361270172000} is an apocalyptic number.

21361270172000 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 21361270172000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28640520548640).

21361270172000 is an abundant number, since it is smaller than the sum of its proper divisors (35919770925280).

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

21361270172000 is a wasteful number, since it uses less digits than its factorization.

21361270172000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212602 (or 212584 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

Adding to 21361270172000 its reverse (27107216312), we get a palindrome (21388377388312).

The spelling of 21361270172000 in words is "twenty-one trillion, three hundred sixty-one billion, two hundred seventy million, one hundred seventy-two thousand".