221611420 has 12 divisors (see below), whose sum is σ = 465384024. Its totient is φ = 88644560.

The previous prime is 221611409. The next prime is 221611433. The reversal of 221611420 is 24116122.

221611420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221611420² = 98223242948832800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5540266 + ... + 5540305.

It is an arithmetic number, because the mean of its divisors is an integer number (38782002).

Almost surely, 2^221611420 is an apocalyptic number.

221611420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221611420 is an abundant number, since it is smaller than the sum of its proper divisors (243772604).

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

221611420 is a wasteful number, since it uses less digits than its factorization.

221611420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11080580 (or 11080578 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 221611420 is about 14886.6188236282. The cubic root of 221611420 is about 605.1514044038.

Adding to 221611420 its reverse (24116122), we get a palindrome (245727542).

The spelling of 221611420 in words is "two hundred twenty-one million, six hundred eleven thousand, four hundred twenty".