1011403123021 has 16 divisors (see below), whose sum is σ = 1056550043520. Its totient is φ = 966354554880.

The previous prime is 1011403122997. The next prime is 1011403123063. The reversal of 1011403123021 is 1203213041101.

It is a cyclic number.

It is not a de Polignac number, because 1011403123021 - 2²⁷ = 1011268905293 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 1011403123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011403123121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111248686 + ... + 111257776.

It is an arithmetic number, because the mean of its divisors is an integer number (66034377720).

Almost surely, 2^{1011403123021} is an apocalyptic number.

It is an amenable number.

1011403123021 is a deficient number, since it is larger than the sum of its proper divisors (45146920499).

1011403123021 is a wasteful number, since it uses less digits than its factorization.

1011403123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13956.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1011403123021 its reverse (1203213041101), we get a palindrome (2214616164122).

The spelling of 1011403123021 in words is "one trillion, eleven billion, four hundred three million, one hundred twenty-three thousand, twenty-one".