10201120021 has 4 divisors (see below), whose sum is σ = 10230018732. Its totient is φ = 10172221312.

The previous prime is 10201120009. The next prime is 10201120031. The reversal of 10201120021 is 12002110201.

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 2181917521 + 8019202500 = 46711^2 + 89550^2 .

It is a cyclic number.

It is not a de Polignac number, because 10201120021 - 2¹¹ = 10201117973 is a prime.

It is a super-3 number, since 3×10201120021³ (a number of 31 digits) contains 333 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 (10201120031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14448826 + ... + 14449531.

It is an arithmetic number, because the mean of its divisors is an integer number (2557504683).

Almost surely, 2^10201120021 is an apocalyptic number.

It is an amenable number.

10201120021 is a deficient number, since it is larger than the sum of its proper divisors (28898711).

10201120021 is an equidigital number, since it uses as much as digits as its factorization.

10201120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28898710.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10201120021 its reverse (12002110201), we get a palindrome (22203230222).

It can be divided in two parts, 10201 and 120021, that multiplied together give a palindrome (1224334221).

The spelling of 10201120021 in words is "ten billion, two hundred one million, one hundred twenty thousand, twenty-one".