21011002107 has 16 divisors (see below), whose sum is σ = 28077634560. Its totient is φ = 13975882272.

The previous prime is 21011002087. The next prime is 21011002141. The reversal of 21011002107 is 70120011012.

It is not a de Polignac number, because 21011002107 - 2⁶ = 21011002043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011002157) 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, 5131353 + ... + 5135445.

It is an arithmetic number, because the mean of its divisors is an integer number (1754852160).

Almost surely, 2^21011002107 is an apocalyptic number.

21011002107 is a deficient number, since it is larger than the sum of its proper divisors (7066632453).

21011002107 is a wasteful number, since it uses less digits than its factorization.

21011002107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7522.

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

Adding to 21011002107 its reverse (70120011012), we get a palindrome (91131013119).

The spelling of 21011002107 in words is "twenty-one billion, eleven million, two thousand, one hundred seven".