21144461352 has 32 divisors (see below), whose sum is σ = 60412747200. Its totient is φ = 6041274624.

The previous prime is 21144461281. The next prime is 21144461357. The reversal of 21144461352 is 25316444112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21144461357) 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, 62929777 + ... + 62930112.

It is an arithmetic number, because the mean of its divisors is an integer number (1887898350).

Almost surely, 2^21144461352 is an apocalyptic number.

It is an amenable number.

21144461352 is an abundant number, since it is smaller than the sum of its proper divisors (39268285848).

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

21144461352 is a wasteful number, since it uses less digits than its factorization.

21144461352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125859905 (or 125859901 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The spelling of 21144461352 in words is "twenty-one billion, one hundred forty-four million, four hundred sixty-one thousand, three hundred fifty-two".