21030213020 has 24 divisors (see below), whose sum is σ = 44168153904. Its totient is φ = 8411188736.

The previous prime is 21030213013. The next prime is 21030213053. The reversal of 21030213020 is 2031203012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21030212986 and 21030213004.

It is a congruent number.

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, 155879 + ... + 257601.

It is an arithmetic number, because the mean of its divisors is an integer number (1840339746).

Almost surely, 2^21030213020 is an apocalyptic number.

21030213020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030213020 is an abundant number, since it is smaller than the sum of its proper divisors (23137940884).

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

21030213020 is a wasteful number, since it uses less digits than its factorization.

21030213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112069 (or 112067 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21030213020 its reverse (2031203012), we get a palindrome (23061416032).

It can be divided in two parts, 210302 and 13020, that added together give a palindrome (223322).

The spelling of 21030213020 in words is "twenty-one billion, thirty million, two hundred thirteen thousand, twenty".