220003921 has 2 divisors, whose sum is σ = 220003922. Its totient is φ = 220003920.

The previous prime is 220003879. The next prime is 220003933. The reversal of 220003921 is 129300022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191434896 + 28569025 = 13836^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 220003921 - 2¹³ = 219995729 is a prime.

It is not a weakly prime, because it can be changed into another prime (220001921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110001960 + 110001961.

It is an arithmetic number, because the mean of its divisors is an integer number (110001961).

Almost surely, 2^220003921 is an apocalyptic number.

It is an amenable number.

220003921 is a deficient number, since it is larger than the sum of its proper divisors (1).

220003921 is an equidigital number, since it uses as much as digits as its factorization.

220003921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 220003921 is about 14832.5291504854. The cubic root of 220003921 is about 603.6846600728.

Adding to 220003921 its reverse (129300022), we get a palindrome (349303943).

It can be divided in two parts, 22000 and 3921, that added together give a square (25921 = 161²).

The spelling of 220003921 in words is "two hundred twenty million, three thousand, nine hundred twenty-one".