21000211012 has 24 divisors (see below), whose sum is σ = 40103894880. Its totient is φ = 9542554560.

The previous prime is 21000210989. The next prime is 21000211021. The reversal of 21000211012 is 21011200012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000211012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70039 + ... + 216577.

It is an arithmetic number, because the mean of its divisors is an integer number (1670995620).

Almost surely, 2^21000211012 is an apocalyptic number.

21000211012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000211012 is a deficient number, since it is larger than the sum of its proper divisors (19103683868).

21000211012 is a wasteful number, since it uses less digits than its factorization.

21000211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149811 (or 149809 counting only the distinct ones).

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

Adding to 21000211012 its reverse (21011200012), we get a palindrome (42011411024).

The spelling of 21000211012 in words is "twenty-one billion, two hundred eleven thousand, twelve".