10202212021 has 4 divisors (see below), whose sum is σ = 10214519500. Its totient is φ = 10189904544.

The previous prime is 10202212019. The next prime is 10202212067. The reversal of 10202212021 is 12021220201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12021220201 = 751 ⋅16006951.

It can be written as a sum of positive squares in 2 ways, for example, as 8015620900 + 2186591121 = 89530^2 + 46761^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202212021 - 2¹ = 10202212019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202211992 and 10202212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202212001) 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, 6152496 + ... + 6154153.

It is an arithmetic number, because the mean of its divisors is an integer number (2553629875).

Almost surely, 2^10202212021 is an apocalyptic number.

It is an amenable number.

10202212021 is a deficient number, since it is larger than the sum of its proper divisors (12307479).

10202212021 is an equidigital number, since it uses as much as digits as its factorization.

10202212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12307478.

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

Adding to 10202212021 its reverse (12021220201), we get a palindrome (22223432222).

The spelling of 10202212021 in words is "ten billion, two hundred two million, two hundred twelve thousand, twenty-one".