221222401020 has 48 divisors (see below), whose sum is σ = 688247471520. Its totient is φ = 58992640128.

The previous prime is 221222401013. The next prime is 221222401061. The reversal of 221222401020 is 20104222122.

221222401020 is a `hidden beast` number, since 2 + 21 + 222 + 401 + 0 + 20 = 666.

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

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 221222400984 and 221222401002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204835017 + ... + 204836096.

It is an arithmetic number, because the mean of its divisors is an integer number (14338488990).

Almost surely, 2^221222401020 is an apocalyptic number.

221222401020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222401020 is an abundant number, since it is smaller than the sum of its proper divisors (467025070500).

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

221222401020 is a wasteful number, since it uses less digits than its factorization.

221222401020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409671131 (or 409671123 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221222401020 its reverse (20104222122), we get a palindrome (241326623142).

The spelling of 221222401020 in words is "two hundred twenty-one billion, two hundred twenty-two million, four hundred one thousand, twenty".