21121002144125 has 64 divisors (see below), whose sum is σ = 29057756023296. Its totient is φ = 15228569664000.

The previous prime is 21121002144113. The next prime is 21121002144139. The reversal of 21121002144125 is 52144120012112.

It is not a de Polignac number, because 21121002144125 - 2⁶ = 21121002144061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121002144094 and 21121002144103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189375377 + ... + 189486873.

It is an arithmetic number, because the mean of its divisors is an integer number (454027437864).

Almost surely, 2^{21121002144125} is an apocalyptic number.

21121002144125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21121002144125 is a deficient number, since it is larger than the sum of its proper divisors (7936753879171).

21121002144125 is a wasteful number, since it uses less digits than its factorization.

21121002144125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114279 (or 114269 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

Adding to 21121002144125 its reverse (52144120012112), we get a palindrome (73265122156237).

The spelling of 21121002144125 in words is "twenty-one trillion, one hundred twenty-one billion, two million, one hundred forty-four thousand, one hundred twenty-five".