221425020 has 72 divisors (see below), whose sum is σ = 689829504. Its totient is φ = 57449088.

The previous prime is 221424997. The next prime is 221425021. The reversal of 221425020 is 20524122.

221425020 is a `hidden beast` number, since 22 + 142 + 502 + 0 = 666.

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 = 221424984 and 221425002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221425021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9964 + ... + 23283.

Almost surely, 2^221425020 is an apocalyptic number.

221425020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221425020 is an abundant number, since it is smaller than the sum of its proper divisors (468404484).

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

221425020 is a wasteful number, since it uses less digits than its factorization.

221425020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33299 (or 33294 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 221425020 is about 14880.3568505597. The cubic root of 221425020 is about 604.9816901318.

Adding to 221425020 its reverse (20524122), we get a palindrome (241949142).

The spelling of 221425020 in words is "two hundred twenty-one million, four hundred twenty-five thousand, twenty".