21110412554121 has 16 divisors (see below), whose sum is σ = 30706212450240. Its totient is φ = 12794123665920.

The previous prime is 21110412554059. The next prime is 21110412554137. The reversal of 21110412554121 is 12145521401112.

It is a happy number.

It is not a de Polignac number, because 21110412554121 - 2⁶ = 21110412554057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110412558121) 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, 5313025 + ... + 8393393.

It is an arithmetic number, because the mean of its divisors is an integer number (1919138278140).

Almost surely, 2^{21110412554121} is an apocalyptic number.

It is an amenable number.

21110412554121 is a deficient number, since it is larger than the sum of its proper divisors (9595799896119).

21110412554121 is a wasteful number, since it uses less digits than its factorization.

21110412554121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288056.

The product of its (nonzero) digits is 3200, while the sum is 30.

Adding to 21110412554121 its reverse (12145521401112), we get a palindrome (33255933955233).

The spelling of 21110412554121 in words is "twenty-one trillion, one hundred ten billion, four hundred twelve million, five hundred fifty-four thousand, one hundred twenty-one".