21102101012 has 12 divisors (see below), whose sum is σ = 36996940596. Its totient is φ = 10531546560.

The previous prime is 21102100951. The next prime is 21102101029. The reversal of 21102101012 is 21010120112.

It can be written as a sum of positive squares in 2 ways, for example, as 14671023376 + 6431077636 = 121124^2 + 80194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102100984 and 21102101002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4873553 + ... + 4877880.

It is an arithmetic number, because the mean of its divisors is an integer number (3083078383).

Almost surely, 2^21102101012 is an apocalyptic number.

It is an amenable number.

21102101012 is a deficient number, since it is larger than the sum of its proper divisors (15894839584).

21102101012 is a wasteful number, since it uses less digits than its factorization.

21102101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9751978 (or 9751976 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102101012 its reverse (21010120112), we get a palindrome (42112221124).

The spelling of 21102101012 in words is "twenty-one billion, one hundred two million, one hundred one thousand, twelve".