2121603431660 has 12 divisors (see below), whose sum is σ = 4455367206528. Its totient is φ = 848641372656.

The previous prime is 2121603431641. The next prime is 2121603431681. The reversal of 2121603431660 is 661343061212.

It is a super-2 number, since 2×2121603431660² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121603431660.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53040085772 + ... + 53040085811.

It is an arithmetic number, because the mean of its divisors is an integer number (371280600544).

Almost surely, 2^{2121603431660} is an apocalyptic number.

2121603431660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121603431660 is an abundant number, since it is smaller than the sum of its proper divisors (2333763774868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121603431660 is a wasteful number, since it uses less digits than its factorization.

2121603431660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106080171592 (or 106080171590 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 2121603431660 its reverse (661343061212), we get a palindrome (2782946492872).

The spelling of 2121603431660 in words is "two trillion, one hundred twenty-one billion, six hundred three million, four hundred thirty-one thousand, six hundred sixty".