21152421348 has 12 divisors (see below), whose sum is σ = 49355649840. Its totient is φ = 7050807112.

The previous prime is 21152421341. The next prime is 21152421349. The reversal of 21152421348 is 84312425112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21152421348² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21152421341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881350878 + ... + 881350901.

It is an arithmetic number, because the mean of its divisors is an integer number (4112970820).

Almost surely, 2^21152421348 is an apocalyptic number.

It is an amenable number.

21152421348 is an abundant number, since it is smaller than the sum of its proper divisors (28203228492).

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

21152421348 is a wasteful number, since it uses less digits than its factorization.

21152421348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762701786 (or 1762701784 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The spelling of 21152421348 in words is "twenty-one billion, one hundred fifty-two million, four hundred twenty-one thousand, three hundred forty-eight".