221230134020 has 96 divisors (see below), whose sum is σ = 533760772608. Its totient is φ = 75450166272.

The previous prime is 221230133989. The next prime is 221230134031. The reversal of 221230134020 is 20431032122.

It is a super-2 number, since 2×221230134020² (a number of 23 digits) contains 22 as substring.

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 = 221230133983 and 221230134001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22036442 + ... + 22046478.

It is an arithmetic number, because the mean of its divisors is an integer number (5560008048).

Almost surely, 2^221230134020 is an apocalyptic number.

221230134020 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 221230134020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266880386304).

221230134020 is an abundant number, since it is smaller than the sum of its proper divisors (312530638588).

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

221230134020 is a wasteful number, since it uses less digits than its factorization.

221230134020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869 (or 10867 counting only the distinct ones).

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

Adding to 221230134020 its reverse (20431032122), we get a palindrome (241661166142).

The spelling of 221230134020 in words is "two hundred twenty-one billion, two hundred thirty million, one hundred thirty-four thousand, twenty".