21193242 has 32 divisors (see below), whose sum is σ = 48729600. Its totient is φ = 6019248.

The previous prime is 21193231. The next prime is 21193247. The reversal of 21193242 is 24239112.

It is a super-3 number, since 3×21193242³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21193247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6109 + ... + 8927.

It is an arithmetic number, because the mean of its divisors is an integer number (1522800).

Almost surely, 2^21193242 is an apocalyptic number.

21193242 is the 3759-th pentagonal number.

21193242 is an abundant number, since it is smaller than the sum of its proper divisors (27536358).

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

21193242 is a wasteful number, since it uses less digits than its factorization.

21193242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010.

The product of its digits is 864, while the sum is 24.

The square root of 21193242 is about 4603.6118428903. The cubic root of 21193242 is about 276.7360890932.

The spelling of 21193242 in words is "twenty-one million, one hundred ninety-three thousand, two hundred forty-two".