6721912101121 has 16 divisors (see below), whose sum is σ = 7739595400320. Its totient is φ = 5718595858560.

The previous prime is 6721912101109. The next prime is 6721912101127. The reversal of 6721912101121 is 1211012191276.

It is a cyclic number.

It is not a de Polignac number, because 6721912101121 - 2¹⁹ = 6721911576833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6721912101127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4980270 + ... + 6184408.

It is an arithmetic number, because the mean of its divisors is an integer number (483724712520).

Almost surely, 2^{6721912101121} is an apocalyptic number.

It is an amenable number.

6721912101121 is a deficient number, since it is larger than the sum of its proper divisors (1017683299199).

6721912101121 is a wasteful number, since it uses less digits than its factorization.

6721912101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210104.

The product of its (nonzero) digits is 3024, while the sum is 34.

Adding to 6721912101121 its reverse (1211012191276), we get a palindrome (7932924292397).

The spelling of 6721912101121 in words is "six trillion, seven hundred twenty-one billion, nine hundred twelve million, one hundred one thousand, one hundred twenty-one".