21220113020 has 12 divisors (see below), whose sum is σ = 44562237384. Its totient is φ = 8488045200.

The previous prime is 21220112999. The next prime is 21220113041. The reversal of 21220113020 is 2031102212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21220112999) and next prime (21220113041).

It is a junction number, because it is equal to n+sod(n) for n = 21220112986 and 21220113004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530502806 + ... + 530502845.

It is an arithmetic number, because the mean of its divisors is an integer number (3713519782).

Almost surely, 2^21220113020 is an apocalyptic number.

21220113020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220113020 is an abundant number, since it is smaller than the sum of its proper divisors (23342124364).

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

21220113020 is a wasteful number, since it uses less digits than its factorization.

21220113020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061005660 (or 1061005658 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21220113020 its reverse (2031102212), we get a palindrome (23251215232).

The spelling of 21220113020 in words is "twenty-one billion, two hundred twenty million, one hundred thirteen thousand, twenty".