21020330030021 has 8 divisors (see below), whose sum is σ = 24024758666304. Its totient is φ = 18016282480320.

The previous prime is 21020330030009. The next prime is 21020330030027. The reversal of 21020330030021 is 12003003302012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020330030021 is a prime.

It is a super-2 number, since 2×21020330030021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020330030027) 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, 95153435 + ... + 95374088.

It is an arithmetic number, because the mean of its divisors is an integer number (3003094833288).

Almost surely, 2^{21020330030021} is an apocalyptic number.

It is an amenable number.

21020330030021 is a deficient number, since it is larger than the sum of its proper divisors (3004428636283).

21020330030021 is a wasteful number, since it uses less digits than its factorization.

21020330030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190543291.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21020330030021 its reverse (12003003302012), we get a palindrome (33023333332033).

The spelling of 21020330030021 in words is "twenty-one trillion, twenty billion, three hundred thirty million, thirty thousand, twenty-one".