21220033446 has 24 divisors (see below), whose sum is σ = 46003035000. Its totient is φ = 7069298976.

The previous prime is 21220033411. The next prime is 21220033447. The reversal of 21220033446 is 64433002212.

21220033446 is a `hidden beast` number, since 2 + 12 + 200 + 3 + 3 + 446 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220033447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304696 + ... + 367803.

It is an arithmetic number, because the mean of its divisors is an integer number (1916793125).

Almost surely, 2^21220033446 is an apocalyptic number.

21220033446 is an abundant number, since it is smaller than the sum of its proper divisors (24783001554).

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

21220033446 is a wasteful number, since it uses less digits than its factorization.

21220033446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674260 (or 674257 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21220033446 its reverse (64433002212), we get a palindrome (85653035658).

The spelling of 21220033446 in words is "twenty-one billion, two hundred twenty million, thirty-three thousand, four hundred forty-six".