21145488 has 160 divisors (see below), whose sum is σ = 69328896. Its totient is φ = 5405184.

The previous prime is 21145483. The next prime is 21145489. The reversal of 21145488 is 88454112.

It is not an unprimeable number, because it can be changed into a prime (21145483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205245 + ... + 205347.

Almost surely, 2^21145488 is an apocalyptic number.

21145488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21145488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34664448).

21145488 is an abundant number, since it is smaller than the sum of its proper divisors (48183408).

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

21145488 is a wasteful number, since it uses less digits than its factorization.

21145488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 175 counting only the distinct ones).

The product of its digits is 10240, while the sum is 33.

The square root of 21145488 is about 4598.4223381503. The cubic root of 21145488 is about 276.5280794917.

The spelling of 21145488 in words is "twenty-one million, one hundred forty-five thousand, four hundred eighty-eight".