21361488 has 20 divisors (see below), whose sum is σ = 55183968. Its totient is φ = 7120480.

The previous prime is 21361477. The next prime is 21361489. The reversal of 21361488 is 88416312.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222468 + ... + 222563.

Almost surely, 2^21361488 is an apocalyptic number.

It is an amenable number.

21361488 is an abundant number, since it is smaller than the sum of its proper divisors (33822480).

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

21361488 is a wasteful number, since it uses less digits than its factorization.

21361488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445042 (or 445036 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 21361488 is about 4621.8489806570. The cubic root of 21361488 is about 277.4664645783.

The spelling of 21361488 in words is "twenty-one million, three hundred sixty-one thousand, four hundred eighty-eight".