2121210043121 has 4 divisors (see below), whose sum is σ = 2284380046452. Its totient is φ = 1958040039792.

The previous prime is 2121210043067. The next prime is 2121210043123. The reversal of 2121210043121 is 1213400121212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 416386278400 + 1704823764721 = 645280^2 + 1305689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121210043121 is a prime.

It is a super-3 number, since 3×2121210043121³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121210043093 and 2121210043102.

It is not an unprimeable number, because it can be changed into a prime (2121210043123) 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, 81585001646 + ... + 81585001671.

It is an arithmetic number, because the mean of its divisors is an integer number (571095011613).

Almost surely, 2^{2121210043121} is an apocalyptic number.

It is an amenable number.

2121210043121 is a deficient number, since it is larger than the sum of its proper divisors (163170003331).

2121210043121 is a wasteful number, since it uses less digits than its factorization.

2121210043121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163170003330.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2121210043121 its reverse (1213400121212), we get a palindrome (3334610164333).

The spelling of 2121210043121 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, forty-three thousand, one hundred twenty-one".