21101002012 has 24 divisors (see below), whose sum is σ = 37456811280. Its totient is φ = 10399977600.

The previous prime is 21101001947. The next prime is 21101002019. The reversal of 21101002012 is 21020010112.

It is a super-3 number, since 3×21101002012³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21101002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101002019) 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, 23337 + ... + 206752.

It is an arithmetic number, because the mean of its divisors is an integer number (1560700470).

Almost surely, 2^21101002012 is an apocalyptic number.

It is an amenable number.

21101002012 is a deficient number, since it is larger than the sum of its proper divisors (16355809268).

21101002012 is a wasteful number, since it uses less digits than its factorization.

21101002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230421 (or 230419 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101002012 its reverse (21020010112), we get a palindrome (42121012124).

It can be divided in two parts, 2110100 and 2012, that added together give a palindrome (2112112).

The spelling of 21101002012 in words is "twenty-one billion, one hundred one million, two thousand, twelve".