10201111021 has 8 divisors (see below), whose sum is σ = 10661668920. Its totient is φ = 9747806208.

The previous prime is 10201110991. The next prime is 10201111027. The reversal of 10201111021 is 12011110201.

It can be written as a sum of positive squares in 4 ways, for example, as 994708521 + 9206402500 = 31539^2 + 95950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10201111021 - 2¹⁵ = 10201078253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10201110989 and 10201111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10201111027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1810396 + ... + 1816021.

It is an arithmetic number, because the mean of its divisors is an integer number (1332708615).

Almost surely, 2^10201111021 is an apocalyptic number.

It is an amenable number.

10201111021 is a deficient number, since it is larger than the sum of its proper divisors (460557899).

10201111021 is an equidigital number, since it uses as much as digits as its factorization.

10201111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3626543.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 10201111021 its reverse (12011110201), we get a palindrome (22212221222).

The spelling of 10201111021 in words is "ten billion, two hundred one million, one hundred eleven thousand, twenty-one".