221425516 has 24 divisors (see below), whose sum is σ = 420600320. Its totient is φ = 101388672.

The previous prime is 221425511. The next prime is 221425517. The reversal of 221425516 is 615524122.

221425516 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221425511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10161 + ... + 23368.

Almost surely, 2^221425516 is an apocalyptic number.

221425516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221425516 is a deficient number, since it is larger than the sum of its proper divisors (199174804).

221425516 is a wasteful number, since it uses less digits than its factorization.

221425516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33673 (or 33671 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 221425516 is about 14880.3735168174. The cubic root of 221425516 is about 604.9821418584.

Adding to 221425516 its reverse (615524122), we get a palindrome (836949638).

It can be divided in two parts, 2214 and 25516, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 221425516 in words is "two hundred twenty-one million, four hundred twenty-five thousand, five hundred sixteen".