1001211220123 has 16 divisors (see below), whose sum is σ = 1055387013120. Its totient is φ = 948539145600.

The previous prime is 1001211220117. The next prime is 1001211220187. The reversal of 1001211220123 is 3210221121001.

It is a cyclic number.

It is not a de Polignac number, because 1001211220123 - 2⁵ = 1001211220091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001211220097 and 1001211220106.

It is not an unprimeable number, because it can be changed into a prime (1001211220193) 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, 694915 + ... + 1576492.

It is an arithmetic number, because the mean of its divisors is an integer number (65961688320).

Almost surely, 2^{1001211220123} is an apocalyptic number.

1001211220123 is a deficient number, since it is larger than the sum of its proper divisors (54175792997).

1001211220123 is a wasteful number, since it uses less digits than its factorization.

1001211220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271738.

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

Adding to 1001211220123 its reverse (3210221121001), we get a palindrome (4211432341124).

The spelling of 1001211220123 in words is "one trillion, one billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-three".