21020102010 has 48 divisors (see below), whose sum is σ = 54743644800. Its totient is φ = 5595988320.

The previous prime is 21020102009. The next prime is 21020102041. The reversal of 21020102010 is 1020102012.

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 = 21020101983 and 21020102001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141046 + ... + 248865.

It is an arithmetic number, because the mean of its divisors is an integer number (1140492600).

Almost surely, 2^21020102010 is an apocalyptic number.

21020102010 is an abundant number, since it is smaller than the sum of its proper divisors (33723542790).

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

21020102010 is a wasteful number, since it uses less digits than its factorization.

21020102010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390523 (or 390520 counting only the distinct ones).

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

Adding to 21020102010 its reverse (1020102012), we get a palindrome (22040204022).

The spelling of 21020102010 in words is "twenty-one billion, twenty million, one hundred two thousand, ten".