10122040021 has 4 divisors (see below), whose sum is σ = 10122896844. Its totient is φ = 10121183200.

The previous prime is 10122040007. The next prime is 10122040039. The reversal of 10122040021 is 12004022101.

It is a happy number.

10122040021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12004022101 = 17449 ⋅687949.

It can be written as a sum of positive squares in 2 ways, for example, as 9142036996 + 980003025 = 95614^2 + 31305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10122040021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10122039983 and 10122040010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10122040921) 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, 410440 + ... + 434401.

It is an arithmetic number, because the mean of its divisors is an integer number (2530724211).

Almost surely, 2^10122040021 is an apocalyptic number.

It is an amenable number.

10122040021 is a deficient number, since it is larger than the sum of its proper divisors (856823).

10122040021 is an equidigital number, since it uses as much as digits as its factorization.

10122040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856822.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 10122040021 its reverse (12004022101), we get a palindrome (22126062122).

The spelling of 10122040021 in words is "ten billion, one hundred twenty-two million, forty thousand, twenty-one".