21197848 has 16 divisors (see below), whose sum is σ = 45424080. Its totient is φ = 9084768.

The previous prime is 21197837. The next prime is 21197851. The reversal of 21197848 is 84879112.

It is a happy number.

It is a super-2 number, since 2×21197848² = 898697519662208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21197848.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189211 + ... + 189322.

It is an arithmetic number, because the mean of its divisors is an integer number (2839005).

Almost surely, 2^21197848 is an apocalyptic number.

21197848 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21197848 is an abundant number, since it is smaller than the sum of its proper divisors (24226232).

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

21197848 is a wasteful number, since it uses less digits than its factorization.

21197848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378546 (or 378542 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 21197848 is about 4604.1120750911. The cubic root of 21197848 is about 276.7561356422.

The spelling of 21197848 in words is "twenty-one million, one hundred ninety-seven thousand, eight hundred forty-eight".