1011001021221 has 4 divisors (see below), whose sum is σ = 1348001361632. Its totient is φ = 674000680812.

The previous prime is 1011001021153. The next prime is 1011001021231. The reversal of 1011001021221 is 1221201001101.

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 not a de Polignac number, because 1011001021221 - 2²⁹ = 1010464150309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1011001021197 and 1011001021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011001021231) 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, 168500170201 + ... + 168500170206.

It is an arithmetic number, because the mean of its divisors is an integer number (337000340408).

Almost surely, 2^{1011001021221} is an apocalyptic number.

It is an amenable number.

1011001021221 is a deficient number, since it is larger than the sum of its proper divisors (337000340411).

1011001021221 is an equidigital number, since it uses as much as digits as its factorization.

1011001021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337000340410.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1011001021221 its reverse (1221201001101), we get a palindrome (2232202022322).

The spelling of 1011001021221 in words is "one trillion, eleven billion, one million, twenty-one thousand, two hundred twenty-one".