21010110020010 has 48 divisors (see below), whose sum is σ = 54627035678280. Its totient is φ = 5602619120640.

The previous prime is 21010110019979. The next prime is 21010110020041. The reversal of 21010110020010 is 1002001101012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21010110019979) and next prime (21010110020041).

It can be written as a sum of positive squares in 4 ways, for example, as 20695957616961 + 314152403049 = 4549281^2 + 560493^2 .

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 = 21010110019974 and 21010110020001.

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 23 ways as a sum of consecutive naturals, for example, 5150350 + ... + 8279270.

Almost surely, 2^{21010110020010} is an apocalyptic number.

21010110020010 is an abundant number, since it is smaller than the sum of its proper divisors (33616925658270).

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

21010110020010 is a wasteful number, since it uses less digits than its factorization.

21010110020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203543 (or 3203540 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21010110020010 its reverse (1002001101012), we get a palindrome (22012111121022).

The spelling of 21010110020010 in words is "twenty-one trillion, ten billion, one hundred ten million, twenty thousand, ten".