21212673 has 8 divisors (see below), whose sum is σ = 28343136. Its totient is φ = 14112000.

The previous prime is 21212663. The next prime is 21212677. The reversal of 21212673 is 37621212.

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

It is not a de Polignac number, because 21212673 - 2⁵ = 21212641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5728 + ... + 8673.

It is an arithmetic number, because the mean of its divisors is an integer number (3542892).

Almost surely, 2^21212673 is an apocalyptic number.

It is an amenable number.

21212673 is a deficient number, since it is larger than the sum of its proper divisors (7130463).

21212673 is a wasteful number, since it uses less digits than its factorization.

21212673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14895.

The product of its digits is 1008, while the sum is 24.

The square root of 21212673 is about 4605.7217675409. The cubic root of 21212673 is about 276.8206383158.

Adding to 21212673 its reverse (37621212), we get a palindrome (58833885).

The spelling of 21212673 in words is "twenty-one million, two hundred twelve thousand, six hundred seventy-three".