21002002020011 has 8 divisors (see below), whose sum is σ = 22235158819920. Its totient is φ = 19781624047392.

The previous prime is 21002002019951. The next prime is 21002002020037. The reversal of 21002002020011 is 11002020020012.

It is a happy number.

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 21002002020011 - 2³⁴ = 20984822150827 is a prime.

It is a super-2 number, since 2×21002002020011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002002019974 and 21002002020001.

It is not an unprimeable number, because it can be changed into a prime (21002002020611) 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, 3194703440 + ... + 3194710013.

It is an arithmetic number, because the mean of its divisors is an integer number (2779394852490).

Almost surely, 2^{21002002020011} is an apocalyptic number.

21002002020011 is a deficient number, since it is larger than the sum of its proper divisors (1233156799909).

21002002020011 is a wasteful number, since it uses less digits than its factorization.

21002002020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6389413645.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002002020011 its reverse (11002020020012), we get a palindrome (32004022040023).

The spelling of 21002002020011 in words is "twenty-one trillion, two billion, two million, twenty thousand, eleven".