2115211686 has 64 divisors (see below), whose sum is σ = 5011476480. Its totient is φ = 582341760.

The previous prime is 2115211643. The next prime is 2115211697. The reversal of 2115211686 is 6861125112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 737896 + ... + 740756.

It is an arithmetic number, because the mean of its divisors is an integer number (78304320).

Almost surely, 2^2115211686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115211686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2505738240).

2115211686 is an abundant number, since it is smaller than the sum of its proper divisors (2896264794).

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

2115211686 is a wasteful number, since it uses less digits than its factorization.

2115211686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3509.

The product of its digits is 5760, while the sum is 33.

The square root of 2115211686 is about 45991.4305713575. The cubic root of 2115211686 is about 1283.6637557158.

Adding to 2115211686 its reverse (6861125112), we get a palindrome (8976336798).

The spelling of 2115211686 in words is "two billion, one hundred fifteen million, two hundred eleven thousand, six hundred eighty-six".