2521221648 has 80 divisors (see below), whose sum is σ = 7168309056. Its totient is φ = 757227520.

The previous prime is 2521221643. The next prime is 2521221649. The reversal of 2521221648 is 8461221252.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2521221641) 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, 38536 + ... + 80792.

Almost surely, 2^2521221648 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 2521221648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3584154528).

2521221648 is an abundant number, since it is smaller than the sum of its proper divisors (4647087408).

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

2521221648 is a wasteful number, since it uses less digits than its factorization.

2521221648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42392 (or 42386 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 2521221648 is about 50211.7680230442. The cubic root of 2521221648 is about 1361.0382872829.

The spelling of 2521221648 in words is "two billion, five hundred twenty-one million, two hundred twenty-one thousand, six hundred forty-eight".