21021120230220 has 288 divisors, whose sum is σ = 72910709673984. Its totient is φ = 4852601740800.

The previous prime is 21021120230147. The next prime is 21021120230269. The reversal of 21021120230220 is 2203202112012.

21021120230220 is a `hidden beast` number, since 2 + 1 + 0 + 211 + 2 + 0 + 230 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21021120230193 and 21021120230202.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9120450 + ... + 11190390.

It is an arithmetic number, because the mean of its divisors is an integer number (253162186368).

Almost surely, 2^{21021120230220} is an apocalyptic number.

21021120230220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021120230220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36455354836992).

21021120230220 is an abundant number, since it is smaller than the sum of its proper divisors (51889589443764).

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

21021120230220 is a wasteful number, since it uses less digits than its factorization.

21021120230220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070213 (or 2070208 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21021120230220 its reverse (2203202112012), we get a palindrome (23224322342232).

The spelling of 21021120230220 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred thirty thousand, two hundred twenty".