21000210123210 has 16 divisors (see below), whose sum is σ = 50400504295776. Its totient is φ = 5600056032848.

The previous prime is 21000210123119. The next prime is 21000210123241. The reversal of 21000210123210 is 1232101200012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21000210123210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350003502024 + ... + 350003502083.

It is an arithmetic number, because the mean of its divisors is an integer number (3150031518486).

Almost surely, 2^{21000210123210} is an apocalyptic number.

21000210123210 is an abundant number, since it is smaller than the sum of its proper divisors (29400294172566).

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

21000210123210 is a wasteful number, since it uses less digits than its factorization.

21000210123210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700007004117.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21000210123210 its reverse (1232101200012), we get a palindrome (22232311323222).

The spelling of 21000210123210 in words is "twenty-one trillion, two hundred ten million, one hundred twenty-three thousand, two hundred ten".