10402124221 has 4 divisors (see below), whose sum is σ = 10412041500. Its totient is φ = 10392206944.

The previous prime is 10402124197. The next prime is 10402124263. The reversal of 10402124221 is 12242120401.

10402124221 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 3741768900 + 6660355321 = 61170^2 + 81611^2 .

It is a cyclic number.

It is not a de Polignac number, because 10402124221 - 2²¹ = 10400027069 is a prime.

It is a super-2 number, since 2×10402124221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10402124021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4957066 + ... + 4959163.

It is an arithmetic number, because the mean of its divisors is an integer number (2603010375).

Almost surely, 2^10402124221 is an apocalyptic number.

It is an amenable number.

10402124221 is a deficient number, since it is larger than the sum of its proper divisors (9917279).

10402124221 is an equidigital number, since it uses as much as digits as its factorization.

10402124221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9917278.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 10402124221 its reverse (12242120401), we get a palindrome (22644244622).

The spelling of 10402124221 in words is "ten billion, four hundred two million, one hundred twenty-four thousand, two hundred twenty-one".