21472896 has 64 divisors (see below), whose sum is σ = 57528000. Its totient is φ = 7096320.

The previous prime is 21472879. The next prime is 21472901. The reversal of 21472896 is 69827412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21472896² = 922170525253632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76276 + ... + 76556.

It is an arithmetic number, because the mean of its divisors is an integer number (898875).

Almost surely, 2^21472896 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 21472896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28764000).

21472896 is an abundant number, since it is smaller than the sum of its proper divisors (36055104).

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

21472896 is a wasteful number, since it uses less digits than its factorization.

21472896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 485 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 21472896 is about 4633.8856265558. The cubic root of 21472896 is about 277.9479915820.

The spelling of 21472896 in words is "twenty-one million, four hundred seventy-two thousand, eight hundred ninety-six".