21153496 has 64 divisors (see below), whose sum is σ = 49896000. Its totient is φ = 8354304.

The previous prime is 21153493. The next prime is 21153497. The reversal of 21153496 is 69435112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35376 + ... + 35968.

It is an arithmetic number, because the mean of its divisors is an integer number (779625).

Almost surely, 2^21153496 is an apocalyptic number.

21153496 is a gapful number since it is divisible by the number (26) 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 21153496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24948000).

21153496 is an abundant number, since it is smaller than the sum of its proper divisors (28742504).

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

21153496 is a wasteful number, since it uses less digits than its factorization.

21153496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 615 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 21153496 is about 4599.2929891452. The cubic root of 21153496 is about 276.5629830351.

The spelling of 21153496 in words is "twenty-one million, one hundred fifty-three thousand, four hundred ninety-six".