10002020111221 has 4 divisors (see below), whose sum is σ = 10002049992352. Its totient is φ = 10001990230092.

The previous prime is 10002020111201. The next prime is 10002020111257. The reversal of 10002020111221 is 12211102020001.

10002020111221 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 10002020111221 - 2⁷ = 10002020111093 is a prime.

It is a super-2 number, since 2×10002020111221² (a number of 27 digits) contains 22 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 (10002020111201) 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, 14432721 + ... + 15109846.

It is an arithmetic number, because the mean of its divisors is an integer number (2500512498088).

Almost surely, 2^{10002020111221} is an apocalyptic number.

It is an amenable number.

10002020111221 is a deficient number, since it is larger than the sum of its proper divisors (29881131).

10002020111221 is an equidigital number, since it uses as much as digits as its factorization.

10002020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29881130.

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

Adding to 10002020111221 its reverse (12211102020001), we get a palindrome (22213122131222).

The spelling of 10002020111221 in words is "ten trillion, two billion, twenty million, one hundred eleven thousand, two hundred twenty-one".