21010012111011 has 16 divisors (see below), whose sum is σ = 34925734418688. Its totient is φ = 10914292005600.

The previous prime is 21010012111009. The next prime is 21010012111063. The reversal of 21010012111011 is 11011121001012.

It is not a de Polignac number, because 21010012111011 - 2¹ = 21010012111009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010012111091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45476216460 + ... + 45476216921.

It is an arithmetic number, because the mean of its divisors is an integer number (2182858401168).

Almost surely, 2^{21010012111011} is an apocalyptic number.

21010012111011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21010012111011 is a deficient number, since it is larger than the sum of its proper divisors (13915722307677).

21010012111011 is a wasteful number, since it uses less digits than its factorization.

21010012111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90952433402.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21010012111011 its reverse (11011121001012), we get a palindrome (32021133112023).

The spelling of 21010012111011 in words is "twenty-one trillion, ten billion, twelve million, one hundred eleven thousand, eleven".