21193016 has 32 divisors (see below), whose sum is σ = 45314640. Its totient is φ = 9205248.

The previous prime is 21192989. The next prime is 21193043. The reversal of 21193016 is 61039112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21192989) and next prime (21193043).

It is a junction number, because it is equal to n+sod(n) for n = 21192982 and 21193000.

It is a congruent number.

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, 4226 + ... + 7761.

Almost surely, 2^21193016 is an apocalyptic number.

21193016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21193016 is an abundant number, since it is smaller than the sum of its proper divisors (24121624).

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

21193016 is a wasteful number, since it uses less digits than its factorization.

21193016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12023 (or 12019 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 21193016 is about 4603.5872968806. The cubic root of 21193016 is about 276.7351054057.

The spelling of 21193016 in words is "twenty-one million, one hundred ninety-three thousand, sixteen".