221224021420 has 24 divisors (see below), whose sum is σ = 473335927344. Its totient is φ = 86819992896.

The previous prime is 221224021387. The next prime is 221224021453. The reversal of 221224021420 is 24120422122.

It is an interprime number because it is at equal distance from previous prime (221224021387) and next prime (221224021453).

It is a junction number, because it is equal to n+sod(n) for n = 221224021391 and 221224021400.

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, 104349894 + ... + 104352013.

It is an arithmetic number, because the mean of its divisors is an integer number (19722330306).

Almost surely, 2^221224021420 is an apocalyptic number.

221224021420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221224021420 is an abundant number, since it is smaller than the sum of its proper divisors (252111905924).

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

221224021420 is a wasteful number, since it uses less digits than its factorization.

221224021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208701969 (or 208701967 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 221224021420 its reverse (24120422122), we get a palindrome (245344443542).

The spelling of 221224021420 in words is "two hundred twenty-one billion, two hundred twenty-four million, twenty-one thousand, four hundred twenty".