21220230123020 has 24 divisors (see below), whose sum is σ = 44602665886800. Its totient is φ = 8480438215232.

The previous prime is 21220230122969. The next prime is 21220230123049. The reversal of 21220230123020 is 2032103202212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21220230122983 and 21220230123001.

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, 478341890 + ... + 478386249.

It is an arithmetic number, because the mean of its divisors is an integer number (1858444411950).

Almost surely, 2^{21220230123020} is an apocalyptic number.

21220230123020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220230123020 is an abundant number, since it is smaller than the sum of its proper divisors (23382435763780).

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

21220230123020 is a wasteful number, since it uses less digits than its factorization.

21220230123020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956729257 (or 956729255 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21220230123020 its reverse (2032103202212), we get a palindrome (23252333325232).

The spelling of 21220230123020 in words is "twenty-one trillion, two hundred twenty billion, two hundred thirty million, one hundred twenty-three thousand, twenty".