2123123111021 has 8 divisors (see below), whose sum is σ = 2390848313088. Its totient is φ = 1867850244000.

The previous prime is 2123123110991. The next prime is 2123123111023. The reversal of 2123123111021 is 1201113213212.

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 2123123111021 - 2¹⁸ = 2123122848877 is a prime.

It is a super-5 number, since 5×2123123111021⁵ (a number of 63 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123123110984 and 2123123111002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123123111023) 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, 3113083400 + ... + 3113084081.

It is an arithmetic number, because the mean of its divisors is an integer number (298856039136).

Almost surely, 2^{2123123111021} is an apocalyptic number.

It is an amenable number.

2123123111021 is a deficient number, since it is larger than the sum of its proper divisors (267725202067).

2123123111021 is a wasteful number, since it uses less digits than its factorization.

2123123111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226167523.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2123123111021 its reverse (1201113213212), we get a palindrome (3324236324233).

The spelling of 2123123111021 in words is "two trillion, one hundred twenty-three billion, one hundred twenty-three million, one hundred eleven thousand, twenty-one".