20010021210 has 48 divisors (see below), whose sum is σ = 53007691464. Its totient is φ = 5235325056.

The previous prime is 20010021203. The next prime is 20010021217. The reversal of 20010021210 is 1212001002.

It is an interprime number because it is at equal distance from previous prime (20010021203) and next prime (20010021217).

It can be written as a sum of positive squares in 4 ways, for example, as 17679159369 + 2330861841 = 132963^2 + 48279^2 .

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 = 20010021192 and 20010021201.

It is not an unprimeable number, because it can be changed into a prime (20010021217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2092717 + ... + 2102256.

Almost surely, 2^20010021210 is an apocalyptic number.

20010021210 is an abundant number, since it is smaller than the sum of its proper divisors (32997670254).

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

20010021210 is a wasteful number, since it uses less digits than its factorization.

20010021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195039 (or 4195036 counting only the distinct ones).

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

Adding to 20010021210 its reverse (1212001002), we get a palindrome (21222022212).

The spelling of 20010021210 in words is "twenty billion, ten million, twenty-one thousand, two hundred ten".