1001211221023 has 16 divisors (see below), whose sum is σ = 1081775096640. Its totient is φ = 921154945536.

The previous prime is 1001211220987. The next prime is 1001211221033. The reversal of 1001211221023 is 3201221121001.

It is a cyclic number.

It is not a de Polignac number, because 1001211221023 - 2⁹ = 1001211220511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001211220988 and 1001211221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211221033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46305111 + ... + 46326727.

It is an arithmetic number, because the mean of its divisors is an integer number (67610943540).

Almost surely, 2^{1001211221023} is an apocalyptic number.

1001211221023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1001211221023 is a deficient number, since it is larger than the sum of its proper divisors (80563875617).

1001211221023 is a wasteful number, since it uses less digits than its factorization.

1001211221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33186.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1001211221023 its reverse (3201221121001), we get a palindrome (4202432342024).

The spelling of 1001211221023 in words is "one trillion, one billion, two hundred eleven million, two hundred twenty-one thousand, twenty-three".