2143328208121 has 3 divisors (see below), whose sum is σ = 2143329672133. Its totient is φ = 2143326744110.

The previous prime is 2143328208101. The next prime is 2143328208137. The reversal of 2143328208121 is 1218028233412.

The square root of 2143328208121 is 1464011.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2143328208121 - 2⁹ = 2143328207609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143328208101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 732006 + ... + 2196016.

Almost surely, 2^{2143328208121} is an apocalyptic number.

2143328208121 is the 1464011-st square number.

2143328208121 is the 732006-th centered octagonal number.

It is an amenable number.

2143328208121 is a deficient number, since it is larger than the sum of its proper divisors (1464012).

2143328208121 is an frugal number, since it uses more digits than its factorization.

2143328208121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928022 (or 1464011 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 2143328208121 in words is "two trillion, one hundred forty-three billion, three hundred twenty-eight million, two hundred eight thousand, one hundred twenty-one".