21444231402 has 48 divisors (see below), whose sum is σ = 53354077920. Its totient is φ = 6156237600.

The previous prime is 21444231343. The next prime is 21444231437. The reversal of 21444231402 is 20413244412.

21444231402 is a `hidden beast` number, since 21 + 4 + 4 + 4 + 231 + 402 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2846349 + ... + 2853872.

It is an arithmetic number, because the mean of its divisors is an integer number (1111543290).

Almost surely, 2^21444231402 is an apocalyptic number.

21444231402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21444231402 is an abundant number, since it is smaller than the sum of its proper divisors (31909846518).

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

21444231402 is a wasteful number, since it uses less digits than its factorization.

21444231402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700259 (or 5700256 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21444231402 its reverse (20413244412), we get a palindrome (41857475814).

The spelling of 21444231402 in words is "twenty-one billion, four hundred forty-four million, two hundred thirty-one thousand, four hundred two".