10011121221221 has 4 divisors (see below), whose sum is σ = 10016612787072. Its totient is φ = 10005629655372.

The previous prime is 10011121221209. The next prime is 10011121221239. The reversal of 10011121221221 is 12212212111001.

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 10011121221221 - 2¹⁴ = 10011121204837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10011121221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011121223221) 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, 2745780191 + ... + 2745783836.

It is an arithmetic number, because the mean of its divisors is an integer number (2504153196768).

Almost surely, 2^{10011121221221} is an apocalyptic number.

It is an amenable number.

10011121221221 is a deficient number, since it is larger than the sum of its proper divisors (5491565851).

10011121221221 is an equidigital number, since it uses as much as digits as its factorization.

10011121221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491565850.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10011121221221 its reverse (12212212111001), we get a palindrome (22223333332222).

The spelling of 10011121221221 in words is "ten trillion, eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".