221222010420 has 72 divisors (see below), whose sum is σ = 673970529960. Its totient is φ = 58734915840.

The previous prime is 221222010409. The next prime is 221222010437. The reversal of 221222010420 is 24010222122.

221222010420 is a `hidden beast` number, since 2 + 2 + 12 + 220 + 10 + 420 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 36861696036 + 184360314384 = 191994^2 + 429372^2 .

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 = 221222010393 and 221222010402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2642211 + ... + 2724650.

It is an arithmetic number, because the mean of its divisors is an integer number (9360701805).

Almost surely, 2^221222010420 is an apocalyptic number.

221222010420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222010420 is an abundant number, since it is smaller than the sum of its proper divisors (452748519540).

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

221222010420 is a wasteful number, since it uses less digits than its factorization.

221222010420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367105 (or 5367100 counting only the distinct ones).

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

Adding to 221222010420 its reverse (24010222122), we get a palindrome (245232232542).

The spelling of 221222010420 in words is "two hundred twenty-one billion, two hundred twenty-two million, ten thousand, four hundred twenty".