21734534453121 has 20 divisors (see below), whose sum is σ = 37105871871552. Its totient is φ = 12419733972888.

The previous prime is 21734534453119. The next prime is 21734534453141. The reversal of 21734534453121 is 12135443543712.

21734534453121 is a `hidden beast` number, since 2 + 1 + 7 + 3 + 4 + 53 + 44 + 531 + 21 = 666.

It is not a de Polignac number, because 21734534453121 - 2¹ = 21734534453119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21734534453141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19166255565 + ... + 19166256698.

Almost surely, 2^{21734534453121} is an apocalyptic number.

21734534453121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21734534453121 is a deficient number, since it is larger than the sum of its proper divisors (15371337418431).

21734534453121 is an equidigital number, since it uses as much as digits as its factorization.

21734534453121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38332512282 (or 38332512273 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

Adding to 21734534453121 its reverse (12135443543712), we get a palindrome (33869977996833).

The spelling of 21734534453121 in words is "twenty-one trillion, seven hundred thirty-four billion, five hundred thirty-four million, four hundred fifty-three thousand, one hundred twenty-one".