10120202021 has 4 divisors (see below), whose sum is σ = 10121210892. Its totient is φ = 10119193152.

The previous prime is 10120201991. The next prime is 10120202033. The reversal of 10120202021 is 12020202101.

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 5592796225 + 4527405796 = 74785^2 + 67286^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120202021 - 2²² = 10116007717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10120201993 and 10120202011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120402021) 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, 489236 + ... + 509501.

It is an arithmetic number, because the mean of its divisors is an integer number (2530302723).

Almost surely, 2^10120202021 is an apocalyptic number.

It is an amenable number.

10120202021 is a deficient number, since it is larger than the sum of its proper divisors (1008871).

10120202021 is an equidigital number, since it uses as much as digits as its factorization.

10120202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008870.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10120202021 its reverse (12020202101), we get a palindrome (22140404122).

The spelling of 10120202021 in words is "ten billion, one hundred twenty million, two hundred two thousand, twenty-one".