21475896 has 64 divisors (see below), whose sum is σ = 61236000. Its totient is φ = 6217728.

The previous prime is 21475889. The next prime is 21475907. The reversal of 21475896 is 69857412.

It is a super-2 number, since 2×21475896² = 922428218005632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3280 + ... + 7328.

Almost surely, 2^21475896 is an apocalyptic number.

21475896 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 21475896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30618000).

21475896 is an abundant number, since it is smaller than the sum of its proper divisors (39760104).

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

21475896 is a wasteful number, since it uses less digits than its factorization.

21475896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088 (or 4084 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 21475896 is about 4634.2093176722. The cubic root of 21475896 is about 277.9609351109.

The spelling of 21475896 in words is "twenty-one million, four hundred seventy-five thousand, eight hundred ninety-six".