2102820957 has 6 divisors (see below), whose sum is σ = 3037408062. Its totient is φ = 1401880632.

The previous prime is 2102820919. The next prime is 2102820983. The reversal of 2102820957 is 7590282012.

It can be written as a sum of positive squares in only one way, i.e., 1872206361 + 230614596 = 43269^2 + 15186^2 .

It is not a de Polignac number, because 2102820957 - 2¹¹ = 2102818909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102820917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116823378 + ... + 116823395.

It is an arithmetic number, because the mean of its divisors is an integer number (506234677).

Almost surely, 2^2102820957 is an apocalyptic number.

It is an amenable number.

2102820957 is a deficient number, since it is larger than the sum of its proper divisors (934587105).

2102820957 is a wasteful number, since it uses less digits than its factorization.

2102820957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233646779 (or 233646776 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 2102820957 is about 45856.5257842327. The cubic root of 2102820957 is about 1281.1523145766.

The spelling of 2102820957 in words is "two billion, one hundred two million, eight hundred twenty thousand, nine hundred fifty-seven".