21010002210 has 64 divisors (see below), whose sum is σ = 58975459200. Its totient is φ = 5307788736.

The previous prime is 21010002203. The next prime is 21010002253. The reversal of 21010002210 is 1220001012.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21010002192 and 21010002201.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2042629 + ... + 2052888.

It is an arithmetic number, because the mean of its divisors is an integer number (921491550).

Almost surely, 2^21010002210 is an apocalyptic number.

21010002210 is an abundant number, since it is smaller than the sum of its proper divisors (37965456990).

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

21010002210 is a wasteful number, since it uses less digits than its factorization.

21010002210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4095552 (or 4095546 counting only the distinct ones).

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

Adding to 21010002210 its reverse (1220001012), we get a palindrome (22230003222).

The spelling of 21010002210 in words is "twenty-one billion, ten million, two thousand, two hundred ten".