21028444302 has 8 divisors (see below), whose sum is σ = 42056888616. Its totient is φ = 7009481432.

The previous prime is 21028444289. The next prime is 21028444309. The reversal of 21028444302 is 20344482012.

It is a sphenic number, since it is the product of 3 distinct primes.

21028444302 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21028444302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21028444309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1752370353 + ... + 1752370364.

It is an arithmetic number, because the mean of its divisors is an integer number (5257111077).

Almost surely, 2^21028444302 is an apocalyptic number.

21028444302 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21028444302 is a wasteful number, since it uses less digits than its factorization.

21028444302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504740722.

The product of its (nonzero) digits is 12288, while the sum is 30.

The spelling of 21028444302 in words is "twenty-one billion, twenty-eight million, four hundred forty-four thousand, three hundred two".