21111000207 has 8 divisors (see below), whose sum is σ = 30706909440. Its totient is φ = 12794545560.

The previous prime is 21111000203. The next prime is 21111000223. The reversal of 21111000207 is 70200011112.

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

It is not a de Polignac number, because 21111000207 - 2² = 21111000203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111000203) 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, 319863607 + ... + 319863672.

It is an arithmetic number, because the mean of its divisors is an integer number (3838363680).

Almost surely, 2^21111000207 is an apocalyptic number.

21111000207 is a deficient number, since it is larger than the sum of its proper divisors (9595909233).

21111000207 is a wasteful number, since it uses less digits than its factorization.

21111000207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639727293.

The product of its (nonzero) digits is 28, while the sum is 15.

Adding to 21111000207 its reverse (70200011112), we get a palindrome (91311011319).

The spelling of 21111000207 in words is "twenty-one billion, one hundred eleven million, two hundred seven", and thus it is an aban number.