21488331 has 8 divisors (see below), whose sum is σ = 29136960. Its totient is φ = 14082632.

The previous prime is 21488329. The next prime is 21488339. The reversal of 21488331 is 13388412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21488331 - 2¹ = 21488329 is a prime.

It is a super-2 number, since 2×21488331² = 923496738331122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21488339) 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, 60525 + ... + 60878.

It is an arithmetic number, because the mean of its divisors is an integer number (3642120).

Almost surely, 2^21488331 is an apocalyptic number.

21488331 is a deficient number, since it is larger than the sum of its proper divisors (7648629).

21488331 is a wasteful number, since it uses less digits than its factorization.

21488331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121465.

The product of its digits is 4608, while the sum is 30.

The square root of 21488331 is about 4635.5507763372. The cubic root of 21488331 is about 278.0145731884.

The spelling of 21488331 in words is "twenty-one million, four hundred eighty-eight thousand, three hundred thirty-one".