2100021210 has 192 divisors, whose sum is σ = 6689060352. Its totient is φ = 446611968.

The previous prime is 2100021181. The next prime is 2100021281. The reversal of 2100021210 is 121200012.

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 = 2100021192 and 2100021201.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 534172 + ... + 538088.

It is an arithmetic number, because the mean of its divisors is an integer number (34838856).

Almost surely, 2^2100021210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100021210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3344530176).

2100021210 is an abundant number, since it is smaller than the sum of its proper divisors (4589039142).

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

2100021210 is a wasteful number, since it uses less digits than its factorization.

2100021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997 (or 3994 counting only the distinct ones).

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

The square root of 2100021210 is about 45825.9883690467. The cubic root of 2100021210 is about 1280.5834762562.

Adding to 2100021210 its reverse (121200012), we get a palindrome (2221221222).

The spelling of 2100021210 in words is "two billion, one hundred million, twenty-one thousand, two hundred ten".