21444033420 has 96 divisors (see below), whose sum is σ = 66744115200. Its totient is φ = 5715893952.

The previous prime is 21444033409. The next prime is 21444033431. The reversal of 21444033420 is 2433044412.

It is a happy number.

21444033420 is a `hidden beast` number, since 214 + 4 + 403 + 3 + 42 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21444033409) and next prime (21444033431).

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1443591 + ... + 1458369.

It is an arithmetic number, because the mean of its divisors is an integer number (695251200).

Almost surely, 2^21444033420 is an apocalyptic number.

21444033420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444033420 is an abundant number, since it is smaller than the sum of its proper divisors (45300081780).

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

21444033420 is a wasteful number, since it uses less digits than its factorization.

21444033420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17484 (or 17476 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21444033420 its reverse (2433044412), we get a palindrome (23877077832).

The spelling of 21444033420 in words is "twenty-one billion, four hundred forty-four million, thirty-three thousand, four hundred twenty".