21144112402 has 48 divisors (see below), whose sum is σ = 38114668800. Its totient is φ = 8762493600.

The previous prime is 21144112393. The next prime is 21144112411. The reversal of 21144112402 is 20421144112.

It is an interprime number because it is at equal distance from previous prime (21144112393) and next prime (21144112411).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5919277 + ... + 5922847.

It is an arithmetic number, because the mean of its divisors is an integer number (794055600).

Almost surely, 2^21144112402 is an apocalyptic number.

21144112402 is a deficient number, since it is larger than the sum of its proper divisors (16970556398).

21144112402 is a wasteful number, since it uses less digits than its factorization.

21144112402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5567 (or 5560 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21144112402 its reverse (20421144112), we get a palindrome (41565256514).

The spelling of 21144112402 in words is "twenty-one billion, one hundred forty-four million, one hundred twelve thousand, four hundred two".