221021014420 has 12 divisors (see below), whose sum is σ = 464144130324. Its totient is φ = 88408405760.

The previous prime is 221021014391. The next prime is 221021014427. The reversal of 221021014420 is 24410120122.

It can be written as a sum of positive squares in 2 ways, for example, as 66425783824 + 154595230596 = 257732^2 + 393186^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021014427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525525341 + ... + 5525525380.

It is an arithmetic number, because the mean of its divisors is an integer number (38678677527).

Almost surely, 2^221021014420 is an apocalyptic number.

221021014420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021014420 is an abundant number, since it is smaller than the sum of its proper divisors (243123115904).

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

221021014420 is a wasteful number, since it uses less digits than its factorization.

221021014420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11051050730 (or 11051050728 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221021014420 its reverse (24410120122), we get a palindrome (245431134542).

The spelling of 221021014420 in words is "two hundred twenty-one billion, twenty-one million, fourteen thousand, four hundred twenty".