21010012211111 has 16 divisors (see below), whose sum is σ = 26339020850688. Its totient is φ = 16280988141600.

The previous prime is 21010012211093. The next prime is 21010012211117. The reversal of 21010012211111 is 11111221001012.

It is a de Polignac number, because none of the positive numbers 2^k-21010012211111 is a prime.

It is a super-2 number, since 2×21010012211111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010012211117) 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, 753735515 + ... + 753763388.

It is an arithmetic number, because the mean of its divisors is an integer number (1646188803168).

Almost surely, 2^{21010012211111} is an apocalyptic number.

21010012211111 is a deficient number, since it is larger than the sum of its proper divisors (5329008639577).

21010012211111 is a wasteful number, since it uses less digits than its factorization.

21010012211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507499102.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21010012211111 its reverse (11111221001012), we get a palindrome (32121233212123).

The spelling of 21010012211111 in words is "twenty-one trillion, ten billion, twelve million, two hundred eleven thousand, one hundred eleven".