21445334 has 4 divisors (see below), whose sum is σ = 32168004. Its totient is φ = 10722666.

The previous prime is 21445331. The next prime is 21445349. The reversal of 21445334 is 43354412.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×21445334³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361332 + ... + 5361335.

It is an arithmetic number, because the mean of its divisors is an integer number (8042001).

Almost surely, 2^21445334 is an apocalyptic number.

21445334 is a deficient number, since it is larger than the sum of its proper divisors (10722670).

21445334 is a wasteful number, since it uses less digits than its factorization.

21445334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722669.

The product of its digits is 5760, while the sum is 26.

The square root of 21445334 is about 4630.9107095689. The cubic root of 21445334 is about 277.8290186124.

Adding to 21445334 its reverse (43354412), we get a palindrome (64799746).

The spelling of 21445334 in words is "twenty-one million, four hundred forty-five thousand, three hundred thirty-four".