2102702121 has 48 divisors (see below), whose sum is σ = 3397605120. Its totient is φ = 1244782080.

The previous prime is 2102702117. The next prime is 2102702141. The reversal of 2102702121 is 1212072012.

It is a happy number.

It is not a de Polignac number, because 2102702121 - 2² = 2102702117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102702094 and 2102702103.

It is not an unprimeable number, because it can be changed into a prime (2102702111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 321201 + ... + 327681.

It is an arithmetic number, because the mean of its divisors is an integer number (70783440).

Almost surely, 2^2102702121 is an apocalyptic number.

It is an amenable number.

2102702121 is a deficient number, since it is larger than the sum of its proper divisors (1294902999).

2102702121 is a wasteful number, since it uses less digits than its factorization.

2102702121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606 (or 6603 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 2102702121 is about 45855.2300288637. The cubic root of 2102702121 is about 1281.1281803481.

Adding to 2102702121 its reverse (1212072012), we get a palindrome (3314774133).

The spelling of 2102702121 in words is "two billion, one hundred two million, seven hundred two thousand, one hundred twenty-one".