21198460 has 12 divisors (see below), whose sum is σ = 44516808. Its totient is φ = 8479376.

The previous prime is 21198427. The next prime is 21198487. The reversal of 21198460 is 6489112.

It is a happy number.

21198460 is nontrivially palindromic in base 9.

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, 529942 + ... + 529981.

It is an arithmetic number, because the mean of its divisors is an integer number (3709734).

Almost surely, 2^21198460 is an apocalyptic number.

21198460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21198460 is an abundant number, since it is smaller than the sum of its proper divisors (23318348).

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

21198460 is a wasteful number, since it uses less digits than its factorization.

21198460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059932 (or 1059930 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21198460 is about 4604.1785369379. The cubic root of 21198460 is about 276.7587990120.

The spelling of 21198460 in words is "twenty-one million, one hundred ninety-eight thousand, four hundred sixty".