21123030310121 has 8 divisors (see below), whose sum is σ = 22373979152040. Its totient is φ = 19873016762368.

The previous prime is 21123030310103. The next prime is 21123030310133. The reversal of 21123030310121 is 12101303032112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3003067180096 + 18119963130025 = 1732936^2 + 4256755^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21123030310121 - 2³⁴ = 21105850440937 is a prime.

It is a super-3 number, since 3×21123030310121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123030310093 and 21123030310102.

It is not an unprimeable number, because it can be changed into a prime (21123030310171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233777036 + ... + 233867373.

It is an arithmetic number, because the mean of its divisors is an integer number (2796747394005).

Almost surely, 2^{21123030310121} is an apocalyptic number.

It is an amenable number.

21123030310121 is a deficient number, since it is larger than the sum of its proper divisors (1250948841919).

21123030310121 is a wasteful number, since it uses less digits than its factorization.

21123030310121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467647083.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21123030310121 its reverse (12101303032112), we get a palindrome (33224333342233).

The spelling of 21123030310121 in words is "twenty-one trillion, one hundred twenty-three billion, thirty million, three hundred ten thousand, one hundred twenty-one".