10210042121 has 4 divisors (see below), whose sum is σ = 10810632852. Its totient is φ = 9609451392.

The previous prime is 10210042109. The next prime is 10210042127. The reversal of 10210042121 is 12124001201.

It is a happy number.

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 7072810000 + 3137232121 = 84100^2 + 56011^2 .

It is a cyclic number.

It is not a de Polignac number, because 10210042121 - 2¹⁸ = 10209779977 is a prime.

It is a super-2 number, since 2×10210042121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10210042096 and 10210042105.

It is not an unprimeable number, because it can be changed into a prime (10210042127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300295340 + ... + 300295373.

It is an arithmetic number, because the mean of its divisors is an integer number (2702658213).

Almost surely, 2^10210042121 is an apocalyptic number.

It is an amenable number.

10210042121 is a deficient number, since it is larger than the sum of its proper divisors (600590731).

10210042121 is an equidigital number, since it uses as much as digits as its factorization.

10210042121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600590730.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10210042121 its reverse (12124001201), we get a palindrome (22334043322).

The spelling of 10210042121 in words is "ten billion, two hundred ten million, forty-two thousand, one hundred twenty-one".