223722021 has 16 divisors (see below), whose sum is σ = 305157888. Its totient is φ = 145728000.

The previous prime is 223722013. The next prime is 223722049. The reversal of 223722021 is 120227322.

It is a happy number.

It is not a de Polignac number, because 223722021 - 2³ = 223722013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223722001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123321 + ... + 125121.

It is an arithmetic number, because the mean of its divisors is an integer number (19072368).

Almost surely, 2^223722021 is an apocalyptic number.

It is an amenable number.

223722021 is a deficient number, since it is larger than the sum of its proper divisors (81435867).

223722021 is a wasteful number, since it uses less digits than its factorization.

223722021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 223722021 is about 14957.3400375869. The cubic root of 223722021 is about 607.0664677740.

Adding to 223722021 its reverse (120227322), we get a palindrome (343949343).

The spelling of 223722021 in words is "two hundred twenty-three million, seven hundred twenty-two thousand, twenty-one".