10001212111021 has 4 divisors (see below), whose sum is σ = 10214003858112. Its totient is φ = 9788420363932.

The previous prime is 10001212111013. The next prime is 10001212111081. The reversal of 10001212111021 is 12011121210001.

It is a happy number.

10001212111021 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 10001212111021 - 2³ = 10001212111013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001212110992 and 10001212111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001212111081) 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, 106395873475 + ... + 106395873568.

It is an arithmetic number, because the mean of its divisors is an integer number (2553500964528).

Almost surely, 2^{10001212111021} is an apocalyptic number.

It is an amenable number.

10001212111021 is a deficient number, since it is larger than the sum of its proper divisors (212791747091).

10001212111021 is an equidigital number, since it uses as much as digits as its factorization.

10001212111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212791747090.

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

Adding to 10001212111021 its reverse (12011121210001), we get a palindrome (22012333321022).

The spelling of 10001212111021 in words is "ten trillion, one billion, two hundred twelve million, one hundred eleven thousand, twenty-one".