21021101310011 has 4 divisors (see below), whose sum is σ = 22932110520024. Its totient is φ = 19110092100000.

The previous prime is 21021101309987. The next prime is 21021101310019. The reversal of 21021101310011 is 11001310112012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21021101310011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021101310019) 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, 955504604990 + ... + 955504605011.

It is an arithmetic number, because the mean of its divisors is an integer number (5733027630006).

Almost surely, 2^{21021101310011} is an apocalyptic number.

21021101310011 is a deficient number, since it is larger than the sum of its proper divisors (1911009210013).

21021101310011 is a wasteful number, since it uses less digits than its factorization.

21021101310011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911009210012.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21021101310011 its reverse (11001310112012), we get a palindrome (32022411422023).

The spelling of 21021101310011 in words is "twenty-one trillion, twenty-one billion, one hundred one million, three hundred ten thousand, eleven".