2121102508638 has 16 divisors (see below), whose sum is σ = 4268230816896. Its totient is φ = 702696536280.

The previous prime is 2121102508633. The next prime is 2121102508649. The reversal of 2121102508638 is 8368052011212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121102508596 and 2121102508605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121102508633) 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, 1084407258 + ... + 1084409213.

It is an arithmetic number, because the mean of its divisors is an integer number (266764426056).

Almost surely, 2^{2121102508638} is an apocalyptic number.

2121102508638 is an abundant number, since it is smaller than the sum of its proper divisors (2147128308258).

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

2121102508638 is a wasteful number, since it uses less digits than its factorization.

2121102508638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168816639.

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 2121102508638 in words is "two trillion, one hundred twenty-one billion, one hundred two million, five hundred eight thousand, six hundred thirty-eight".