2115921912 has 64 divisors (see below), whose sum is σ = 5730564000. Its totient is φ = 651036672.

The previous prime is 2115921901. The next prime is 2115921917. The reversal of 2115921912 is 2191295112.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115921917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32664 + ... + 72792.

Almost surely, 2^2115921912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115921912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2865282000).

2115921912 is an abundant number, since it is smaller than the sum of its proper divisors (3614642088).

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

2115921912 is a wasteful number, since it uses less digits than its factorization.

2115921912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40177 (or 40147 counting only the distinct ones).

The product of its digits is 3240, while the sum is 33.

The square root of 2115921912 is about 45999.1512095604. The cubic root of 2115921912 is about 1283.8074118425.

It can be divided in two parts, 21159 and 21912, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 2115921912 in words is "two billion, one hundred fifteen million, nine hundred twenty-one thousand, nine hundred twelve".