1123121001021 has 16 divisors (see below), whose sum is σ = 1532575344960. Its totient is φ = 731212796160.

The previous prime is 1123121001019. The next prime is 1123121001043. The reversal of 1123121001021 is 1201001213211.

It is not a de Polignac number, because 1123121001021 - 2¹ = 1123121001019 is a prime.

It is a super-2 number, since 2×1123121001021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123121001061) 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, 55701 + ... + 1499781.

It is an arithmetic number, because the mean of its divisors is an integer number (95785959060).

Almost surely, 2^{1123121001021} is an apocalyptic number.

It is an amenable number.

1123121001021 is a deficient number, since it is larger than the sum of its proper divisors (409454343939).

1123121001021 is a wasteful number, since it uses less digits than its factorization.

1123121001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450156.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1123121001021 its reverse (1201001213211), we get a palindrome (2324122214232).

The spelling of 1123121001021 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-one million, one thousand, twenty-one".