21020000010210 has 24 divisors (see below), whose sum is σ = 54652000026780. Its totient is φ = 5605333336032.

The previous prime is 21020000010173. The next prime is 21020000010221. The reversal of 21020000010210 is 1201000002012.

It can be written as a sum of positive squares in 2 ways, for example, as 20839562811369 + 180437198841 = 4565037^2 + 424779^2 .

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 = 21020000010192 and 21020000010201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116777777745 + ... + 116777777924.

Almost surely, 2^{21020000010210} is an apocalyptic number.

21020000010210 is an abundant number, since it is smaller than the sum of its proper divisors (33632000016570).

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

21020000010210 is a wasteful number, since it uses less digits than its factorization.

21020000010210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233555555682 (or 233555555679 counting only the distinct ones).

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

Adding to 21020000010210 its reverse (1201000002012), we get a palindrome (22221000012222).

The spelling of 21020000010210 in words is "twenty-one trillion, twenty billion, ten thousand, two hundred ten".