10021123121 has 4 divisors (see below), whose sum is σ = 10133720100. Its totient is φ = 9908526144.

The previous prime is 10021123103. The next prime is 10021123139. The reversal of 10021123121 is 12132112001.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (10021123103) and next prime (10021123139).

It can be written as a sum of positive squares in 2 ways, for example, as 1026497521 + 8994625600 = 32039^2 + 94840^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021123121 - 2¹⁴ = 10021106737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021123096 and 10021123105.

It is not an unprimeable number, because it can be changed into a prime (10021123181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56298356 + ... + 56298533.

It is an arithmetic number, because the mean of its divisors is an integer number (2533430025).

Almost surely, 2^10021123121 is an apocalyptic number.

It is an amenable number.

10021123121 is a deficient number, since it is larger than the sum of its proper divisors (112596979).

10021123121 is an equidigital number, since it uses as much as digits as its factorization.

10021123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112596978.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 10021123121 its reverse (12132112001), we get a palindrome (22153235122).

The spelling of 10021123121 in words is "ten billion, twenty-one million, one hundred twenty-three thousand, one hundred twenty-one".