20210100210 has 40 divisors (see below), whose sum is σ = 54342716076. Its totient is φ = 5389359840.

The previous prime is 20210100199. The next prime is 20210100247. The reversal of 20210100210 is 1200101202.

It can be written as a sum of positive squares in 2 ways, for example, as 18618329601 + 1591770609 = 136449^2 + 39897^2 .

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 = 20210100192 and 20210100201.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12474561 + ... + 12476180.

Almost surely, 2^20210100210 is an apocalyptic number.

20210100210 is an abundant number, since it is smaller than the sum of its proper divisors (34132615866).

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

20210100210 is a wasteful number, since it uses less digits than its factorization.

20210100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24950760 (or 24950751 counting only the distinct ones).

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

Adding to 20210100210 its reverse (1200101202), we get a palindrome (21410201412).

The spelling of 20210100210 in words is "twenty billion, two hundred ten million, one hundred thousand, two hundred ten".