2154221368 has 96 divisors (see below), whose sum is σ = 4875778800. Its totient is φ = 886339584.

The previous prime is 2154221347. The next prime is 2154221383. The reversal of 2154221368 is 8631224512.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 434230 + ... + 439162.

Almost surely, 2^2154221368 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 2154221368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2437889400).

2154221368 is an abundant number, since it is smaller than the sum of its proper divisors (2721557432).

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

2154221368 is a wasteful number, since it uses less digits than its factorization.

2154221368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4984 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 2154221368 is about 46413.5903373139. The cubic root of 2154221368 is about 1291.5070358751.

The spelling of 2154221368 in words is "two billion, one hundred fifty-four million, two hundred twenty-one thousand, three hundred sixty-eight".