21100000207 has 12 divisors (see below), whose sum is σ = 24976607320. Its totient is φ = 17706292560.

The previous prime is 21100000157. The next prime is 21100000219. The reversal of 21100000207 is 70200000112.

It is not a de Polignac number, because 21100000207 - 2¹⁹ = 21099475919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100000297) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6705357 + ... + 6708502.

Almost surely, 2^21100000207 is an apocalyptic number.

21100000207 is a deficient number, since it is larger than the sum of its proper divisors (3876607113).

21100000207 is a wasteful number, since it uses less digits than its factorization.

21100000207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13413894 (or 13413883 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 13.

Adding to 21100000207 its reverse (70200000112), we get a palindrome (91300000319).

The spelling of 21100000207 in words is "twenty-one billion, one hundred million, two hundred seven", and thus it is an aban number.