220010002021 has 4 divisors (see below), whose sum is σ = 221149950412. Its totient is φ = 218870053632.

The previous prime is 220010001983. The next prime is 220010002057. The reversal of 220010002021 is 120200010022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125235300996 + 94774701025 = 353886^2 + 307855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220010002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220010001989 and 220010002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220010002081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569973906 + ... + 569974291.

It is an arithmetic number, because the mean of its divisors is an integer number (55287487603).

Almost surely, 2^220010002021 is an apocalyptic number.

It is an amenable number.

220010002021 is a deficient number, since it is larger than the sum of its proper divisors (1139948391).

220010002021 is a wasteful number, since it uses less digits than its factorization.

220010002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139948390.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 220010002021 its reverse (120200010022), we get a palindrome (340210012043).

The spelling of 220010002021 in words is "two hundred twenty billion, ten million, two thousand, twenty-one".