21002010120011 has 4 divisors (see below), whose sum is σ = 21398274461952. Its totient is φ = 20605745778072.

The previous prime is 21002010119941. The next prime is 21002010120073. The reversal of 21002010120011 is 11002101020012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002010120011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002010119974 and 21002010120001.

It is not an unprimeable number, because it can be changed into a prime (21002010120211) 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, 198132170891 + ... + 198132170996.

It is an arithmetic number, because the mean of its divisors is an integer number (5349568615488).

Almost surely, 2^{21002010120011} is an apocalyptic number.

21002010120011 is a deficient number, since it is larger than the sum of its proper divisors (396264341941).

21002010120011 is an equidigital number, since it uses as much as digits as its factorization.

21002010120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396264341940.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21002010120011 its reverse (11002101020012), we get a palindrome (32004111140023).

Subtracting from 21002010120011 its reverse (11002101020012), we obtain a palindrome (9999909099999).

The spelling of 21002010120011 in words is "twenty-one trillion, two billion, ten million, one hundred twenty thousand, eleven".