2123100121021 has 32 divisors (see below), whose sum is σ = 2513639713536. Its totient is φ = 1771209216000.

The previous prime is 2123100121007. The next prime is 2123100121031. The reversal of 2123100121021 is 1201210013212.

It is a cyclic number.

It is not a de Polignac number, because 2123100121021 - 2⁷ = 2123100120893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123100120986 and 2123100121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123100121001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13114456 + ... + 13275358.

It is an arithmetic number, because the mean of its divisors is an integer number (78551241048).

Almost surely, 2^{2123100121021} is an apocalyptic number.

It is an amenable number.

2123100121021 is a deficient number, since it is larger than the sum of its proper divisors (390539592515).

2123100121021 is a wasteful number, since it uses less digits than its factorization.

2123100121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162693.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2123100121021 its reverse (1201210013212), we get a palindrome (3324310134233).

The spelling of 2123100121021 in words is "two trillion, one hundred twenty-three billion, one hundred million, one hundred twenty-one thousand, twenty-one".