2198514942121 has 3 divisors (see below), whose sum is σ = 2198516424861. Its totient is φ = 2198513459382.

The previous prime is 2198514942119. The next prime is 2198514942131. The reversal of 2198514942121 is 1212494158912.

The square root of 2198514942121 is 1482739.

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 2198514942121 - 2¹ = 2198514942119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2198514942131) 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, 741370 + ... + 2224108.

It is an arithmetic number, because the mean of its divisors is an integer number (732838808287).

Almost surely, 2^{2198514942121} is an apocalyptic number.

2198514942121 is the 1482739-th square number.

2198514942121 is the 741370-th centered octagonal number.

It is an amenable number.

2198514942121 is a deficient number, since it is larger than the sum of its proper divisors (1482740).

2198514942121 is an frugal number, since it uses more digits than its factorization.

2198514942121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965478 (or 1482739 counting only the distinct ones).

The product of its digits is 414720, while the sum is 49.

Multiplying 2198514942121 by its sum of digits (49), we get a square (107727232163929 = 10379173²).

The spelling of 2198514942121 in words is "two trillion, one hundred ninety-eight billion, five hundred fourteen million, nine hundred forty-two thousand, one hundred twenty-one".