21012003111 has 16 divisors (see below), whose sum is σ = 32360732928. Its totient is φ = 11985456000.

The previous prime is 21012003101. The next prime is 21012003137. The reversal of 21012003111 is 11130021012.

It is not a de Polignac number, because 21012003111 - 2⁵ = 21012003079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012003101) 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, 18726715 + ... + 18727836.

It is an arithmetic number, because the mean of its divisors is an integer number (2022545808).

Almost surely, 2^21012003111 is an apocalyptic number.

21012003111 is a deficient number, since it is larger than the sum of its proper divisors (11348729817).

21012003111 is a wasteful number, since it uses less digits than its factorization.

21012003111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37454582.

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

Adding to 21012003111 its reverse (11130021012), we get a palindrome (32142024123).

The spelling of 21012003111 in words is "twenty-one billion, twelve million, three thousand, one hundred eleven".