2157216648 has 32 divisors (see below), whose sum is σ = 5421288960. Its totient is φ = 715305920.

The previous prime is 2157216641. The next prime is 2157216673. The reversal of 2157216648 is 8466127512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2157216641) 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, 230715 + ... + 239882.

It is an arithmetic number, because the mean of its divisors is an integer number (169415280).

Almost surely, 2^2157216648 is an apocalyptic number.

It is an amenable number.

2157216648 is an abundant number, since it is smaller than the sum of its proper divisors (3264072312).

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

2157216648 is a wasteful number, since it uses less digits than its factorization.

2157216648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470797 (or 470793 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 2157216648 is about 46445.8464020196. The cubic root of 2157216648 is about 1292.1053392372.

The spelling of 2157216648 in words is "two billion, one hundred fifty-seven million, two hundred sixteen thousand, six hundred forty-eight".