21145792244 has 24 divisors (see below), whose sum is σ = 39205764360. Its totient is φ = 9944902656.

The previous prime is 21145792243. The next prime is 21145792277. The reversal of 21145792244 is 44229754112.

It can be written as a sum of positive squares in 4 ways, for example, as 759663844 + 20386128400 = 27562^2 + 142780^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145792243) 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 7 ways as a sum of consecutive naturals, for example, 18842 + ... + 206510.

It is an arithmetic number, because the mean of its divisors is an integer number (1633573515).

Almost surely, 2^21145792244 is an apocalyptic number.

It is an amenable number.

21145792244 is a deficient number, since it is larger than the sum of its proper divisors (18059972116).

21145792244 is a wasteful number, since it uses less digits than its factorization.

21145792244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189347 (or 189345 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The spelling of 21145792244 in words is "twenty-one billion, one hundred forty-five million, seven hundred ninety-two thousand, two hundred forty-four".