10211212021 has 4 divisors (see below), whose sum is σ = 10448682112. Its totient is φ = 9973741932.

The previous prime is 10211212001. The next prime is 10211212091. The reversal of 10211212021 is 12021211201.

10211212021 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10211212021 - 2⁷ = 10211211893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10211211992 and 10211212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118734981 + ... + 118735066.

It is an arithmetic number, because the mean of its divisors is an integer number (2612170528).

Almost surely, 2^10211212021 is an apocalyptic number.

It is an amenable number.

10211212021 is a deficient number, since it is larger than the sum of its proper divisors (237470091).

10211212021 is an equidigital number, since it uses as much as digits as its factorization.

10211212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237470090.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10211212021 its reverse (12021211201), we get a palindrome (22232423222).

The spelling of 10211212021 in words is "ten billion, two hundred eleven million, two hundred twelve thousand, twenty-one".