210042122020 has 24 divisors (see below), whose sum is σ = 441097111224. Its totient is φ = 84015200256.

The previous prime is 210042121999. The next prime is 210042122041. The reversal of 210042122020 is 20221240012.

It is an interprime number because it is at equal distance from previous prime (210042121999) and next prime (210042122041).

It can be written as a sum of positive squares in 4 ways, for example, as 59460871716 + 150581250304 = 243846^2 + 388048^2 .

It is a junction number, because it is equal to n+sod(n) for n = 210042121985 and 210042122003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1790202 + ... + 1903918.

It is an arithmetic number, because the mean of its divisors is an integer number (18379046301).

Almost surely, 2^210042122020 is an apocalyptic number.

210042122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210042122020 is an abundant number, since it is smaller than the sum of its proper divisors (231054989204).

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

210042122020 is a wasteful number, since it uses less digits than its factorization.

210042122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206079 (or 206077 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 210042122020 its reverse (20221240012), we get a palindrome (230263362032).

The spelling of 210042122020 in words is "two hundred ten billion, forty-two million, one hundred twenty-two thousand, twenty".