221407420 has 48 divisors (see below), whose sum is σ = 501808608. Its totient is φ = 81573120.

The previous prime is 221407411. The next prime is 221407441. The reversal of 221407420 is 24704122.

It is a happy number.

221407420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221407391 and 221407400.

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, 227535 + ... + 228505.

It is an arithmetic number, because the mean of its divisors is an integer number (10454346).

Almost surely, 2^221407420 is an apocalyptic number.

221407420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221407420 is an abundant number, since it is smaller than the sum of its proper divisors (280401188).

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

221407420 is a wasteful number, since it uses less digits than its factorization.

221407420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1868 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 221407420 is about 14879.7654551407. The cubic root of 221407420 is about 604.9656606879.

The spelling of 221407420 in words is "two hundred twenty-one million, four hundred seven thousand, four hundred twenty".