21444021402 has 32 divisors (see below), whose sum is σ = 44165438592. Its totient is φ = 6936145344.

The previous prime is 21444021397. The next prime is 21444021463. The reversal of 21444021402 is 20412044412.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 46678 + ... + 212289.

It is an arithmetic number, because the mean of its divisors is an integer number (1380169956).

Almost surely, 2^21444021402 is an apocalyptic number.

21444021402 is an abundant number, since it is smaller than the sum of its proper divisors (22721417190).

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

21444021402 is a wasteful number, since it uses less digits than its factorization.

21444021402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259382.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21444021402 its reverse (20412044412), we get a palindrome (41856065814).

The spelling of 21444021402 in words is "twenty-one billion, four hundred forty-four million, twenty-one thousand, four hundred two".