1000211001221 has 4 divisors (see below), whose sum is σ = 1000215438444. Its totient is φ = 1000206564000.

The previous prime is 1000211001203. The next prime is 1000211001271. The reversal of 1000211001221 is 1221001120001.

1000211001221 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 can be written as a sum of positive squares in 2 ways, for example, as 264853300321 + 735357700900 = 514639^2 + 857530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000211001221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000211001271) 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, 1861310 + ... + 2337711.

It is an arithmetic number, because the mean of its divisors is an integer number (250053859611).

Almost surely, 2^{1000211001221} is an apocalyptic number.

It is an amenable number.

1000211001221 is a deficient number, since it is larger than the sum of its proper divisors (4437223).

1000211001221 is an equidigital number, since it uses as much as digits as its factorization.

1000211001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437222.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1000211001221 its reverse (1221001120001), we get a palindrome (2221212121222).

The spelling of 1000211001221 in words is "one trillion, two hundred eleven million, one thousand, two hundred twenty-one".