21000212010 has 32 divisors (see below), whose sum is σ = 56000566080. Its totient is φ = 5600056464.

The previous prime is 21000211993. The next prime is 21000212027. The reversal of 21000212010 is 1021200012.

It is an interprime number because it is at equal distance from previous prime (21000211993) and next prime (21000212027).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21000211983 and 21000212001.

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 15 ways as a sum of consecutive naturals, for example, 38889012 + ... + 38889551.

It is an arithmetic number, because the mean of its divisors is an integer number (1750017690).

Almost surely, 2^21000212010 is an apocalyptic number.

21000212010 is an abundant number, since it is smaller than the sum of its proper divisors (35000354070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000212010 is a wasteful number, since it uses less digits than its factorization.

21000212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77778579 (or 77778573 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21000212010 its reverse (1021200012), we get a palindrome (22021412022).

The spelling of 21000212010 in words is "twenty-one billion, two hundred twelve thousand, ten".