2121398663 has 8 divisors (see below), whose sum is σ = 2184349440. Its totient is φ = 2058743520.

The previous prime is 2121398641. The next prime is 2121398681. The reversal of 2121398663 is 3668931212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121398663 - 2⁸ = 2121398407 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 2121398663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121391663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59303 + ... + 88088.

It is an arithmetic number, because the mean of its divisors is an integer number (273043680).

Almost surely, 2^2121398663 is an apocalyptic number.

2121398663 is a deficient number, since it is larger than the sum of its proper divisors (62950777).

2121398663 is a wasteful number, since it uses less digits than its factorization.

2121398663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147817.

The product of its digits is 93312, while the sum is 41.

The square root of 2121398663 is about 46058.6437381736. The cubic root of 2121398663 is about 1284.9141061049.

The spelling of 2121398663 in words is "two billion, one hundred twenty-one million, three hundred ninety-eight thousand, six hundred sixty-three".