10211011210021 has 4 divisors (see below), whose sum is σ = 10211063429772. Its totient is φ = 10210958990272.

The previous prime is 10211011210009. The next prime is 10211011210033. The reversal of 10211011210021 is 12001211011201.

It is a happy number.

10211011210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (10211011210009) and next prime (10211011210033).

It can be written as a sum of positive squares in 2 ways, for example, as 3947433844225 + 6263577365796 = 1986815^2 + 2502714^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211011210021 - 2¹³ = 10211011201829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10211011209983 and 10211011210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211011210051) 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, 25815460 + ... + 26208013.

It is an arithmetic number, because the mean of its divisors is an integer number (2552765857443).

Almost surely, 2^{10211011210021} is an apocalyptic number.

It is an amenable number.

10211011210021 is a deficient number, since it is larger than the sum of its proper divisors (52219751).

10211011210021 is an equidigital number, since it uses as much as digits as its factorization.

10211011210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52219750.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10211011210021 its reverse (12001211011201), we get a palindrome (22212222221222).

The spelling of 10211011210021 in words is "ten trillion, two hundred eleven billion, eleven million, two hundred ten thousand, twenty-one".