21012203111 has 8 divisors (see below), whose sum is σ = 21130924464. Its totient is φ = 20893662720.

The previous prime is 21012203071. The next prime is 21012203129. The reversal of 21012203111 is 11130221012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012203111 - 2³⁰ = 19938461287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012203161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191111 + ... + 280263.

It is an arithmetic number, because the mean of its divisors is an integer number (2641365558).

Almost surely, 2^21012203111 is an apocalyptic number.

21012203111 is a deficient number, since it is larger than the sum of its proper divisors (118721353).

21012203111 is a wasteful number, since it uses less digits than its factorization.

21012203111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90481.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21012203111 its reverse (11130221012), we get a palindrome (32142424123).

The spelling of 21012203111 in words is "twenty-one billion, twelve million, two hundred three thousand, one hundred eleven".