21103102012 has 24 divisors (see below), whose sum is σ = 37560689712. Its totient is φ = 10371705600.

The previous prime is 21103101973. The next prime is 21103102043. The reversal of 21103102012 is 21020130112.

It is a super-3 number, since 3×21103102012³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21103101983 and 21103102001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351087 + ... + 406777.

It is an arithmetic number, because the mean of its divisors is an integer number (1565028738).

Almost surely, 2^21103102012 is an apocalyptic number.

It is an amenable number.

21103102012 is a deficient number, since it is larger than the sum of its proper divisors (16457587700).

21103102012 is a wasteful number, since it uses less digits than its factorization.

21103102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57309 (or 57307 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21103102012 its reverse (21020130112), we get a palindrome (42123232124).

The spelling of 21103102012 in words is "twenty-one billion, one hundred three million, one hundred two thousand, twelve".