221321020 has 24 divisors (see below), whose sum is σ = 469569744. Its totient is φ = 87614976.

The previous prime is 221321003. The next prime is 221321027. The reversal of 221321020 is 20123122.

221321020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321027) 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, 55102 + ... + 58981.

It is an arithmetic number, because the mean of its divisors is an integer number (19565406).

Almost surely, 2^221321020 is an apocalyptic number.

221321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221321020 is an abundant number, since it is smaller than the sum of its proper divisors (248248724).

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

221321020 is a wasteful number, since it uses less digits than its factorization.

221321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114189 (or 114187 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221321020 is about 14876.8619002799. The cubic root of 221321020 is about 604.8869583668.

Adding to 221321020 its reverse (20123122), we get a palindrome (241444142).

The spelling of 221321020 in words is "two hundred twenty-one million, three hundred twenty-one thousand, twenty".