21002030021323 has 8 divisors (see below), whose sum is σ = 22890071646288. Its totient is φ = 19152917089824.

The previous prime is 21002030021317. The next prime is 21002030021387. The reversal of 21002030021323 is 32312003020012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002030021323 - 2³⁷ = 20864591067851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002030021323.

It is not an unprimeable number, because it can be changed into a prime (21002030021023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9732172240 + ... + 9732174397.

It is an arithmetic number, because the mean of its divisors is an integer number (2861258955786).

Almost surely, 2^{21002030021323} is an apocalyptic number.

21002030021323 is a deficient number, since it is larger than the sum of its proper divisors (1888041624965).

21002030021323 is a wasteful number, since it uses less digits than its factorization.

21002030021323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19464346733.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21002030021323 its reverse (32312003020012), we get a palindrome (53314033041335).

The spelling of 21002030021323 in words is "twenty-one trillion, two billion, thirty million, twenty-one thousand, three hundred twenty-three".