2121603431659 has 4 divisors (see below), whose sum is σ = 2121617601880. Its totient is φ = 2121589261440.

The previous prime is 2121603431641. The next prime is 2121603431681. The reversal of 2121603431659 is 9561343061212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121603431659 - 2⁹ = 2121603431147 is a prime.

It is a super-2 number, since 2×2121603431659² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121603411659) 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, 6858102 + ... + 7160779.

It is an arithmetic number, because the mean of its divisors is an integer number (530404400470).

Almost surely, 2^{2121603431659} is an apocalyptic number.

2121603431659 is a deficient number, since it is larger than the sum of its proper divisors (14170221).

2121603431659 is a wasteful number, since it uses less digits than its factorization.

2121603431659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170220.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 2121603431659 in words is "two trillion, one hundred twenty-one billion, six hundred three million, four hundred thirty-one thousand, six hundred fifty-nine".