21373442 has 8 divisors (see below), whose sum is σ = 33747600. Its totient is φ = 10124244.

The previous prime is 21373411. The next prime is 21373447. The reversal of 21373442 is 24437312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21373447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281192 + ... + 281267.

It is an arithmetic number, because the mean of its divisors is an integer number (4218450).

Almost surely, 2^21373442 is an apocalyptic number.

21373442 is a deficient number, since it is larger than the sum of its proper divisors (12374158).

21373442 is a wasteful number, since it uses less digits than its factorization.

21373442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562480.

The product of its digits is 4032, while the sum is 26.

The square root of 21373442 is about 4623.1420051735. The cubic root of 21373442 is about 277.5182121532.

The spelling of 21373442 in words is "twenty-one million, three hundred seventy-three thousand, four hundred forty-two".