21220404152 has 16 divisors (see below), whose sum is σ = 40538980440. Its totient is φ = 10410009376.

The previous prime is 21220404151. The next prime is 21220404181. The reversal of 21220404152 is 25140402212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220404151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25023638 + ... + 25024485.

Almost surely, 2^21220404152 is an apocalyptic number.

It is an amenable number.

21220404152 is a deficient number, since it is larger than the sum of its proper divisors (19318576288).

21220404152 is a wasteful number, since it uses less digits than its factorization.

21220404152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50048182 (or 50048178 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21220404152 its reverse (25140402212), we get a palindrome (46360806364).

The spelling of 21220404152 in words is "twenty-one billion, two hundred twenty million, four hundred four thousand, one hundred fifty-two".