2121708699663 has 8 divisors (see below), whose sum is σ = 3233079923328. Its totient is φ = 1212404971224.

The previous prime is 2121708699623. The next prime is 2121708699673. The reversal of 2121708699663 is 3669968071212.

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

It is not a de Polignac number, because 2121708699663 - 2¹⁴ = 2121708683279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121708699597 and 2121708699606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121708699623) 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, 50516873781 + ... + 50516873822.

It is an arithmetic number, because the mean of its divisors is an integer number (404134990416).

Almost surely, 2^{2121708699663} is an apocalyptic number.

2121708699663 is a deficient number, since it is larger than the sum of its proper divisors (1111371223665).

2121708699663 is a wasteful number, since it uses less digits than its factorization.

2121708699663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101033747613.

The product of its (nonzero) digits is 11757312, while the sum is 60.

The spelling of 2121708699663 in words is "two trillion, one hundred twenty-one billion, seven hundred eight million, six hundred ninety-nine thousand, six hundred sixty-three".