21444024402 has 48 divisors (see below), whose sum is σ = 49092039360. Its totient is φ = 7013131632.

The previous prime is 21444024379. The next prime is 21444024403. The reversal of 21444024402 is 20442044412.

21444024402 is a `hidden beast` number, since 214 + 4 + 4 + 0 + 2 + 440 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21444024403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390502 + ... + 442017.

It is an arithmetic number, because the mean of its divisors is an integer number (1022750820).

Almost surely, 2^21444024402 is an apocalyptic number.

21444024402 is an abundant number, since it is smaller than the sum of its proper divisors (27648014958).

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

21444024402 is an equidigital number, since it uses as much as digits as its factorization.

21444024402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832589 (or 832577 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 27.

Adding to 21444024402 its reverse (20442044412), we get a palindrome (41886068814).

The spelling of 21444024402 in words is "twenty-one billion, four hundred forty-four million, twenty-four thousand, four hundred two".