2220170421 has 16 divisors (see below), whose sum is σ = 3384534528. Its totient is φ = 1268137200.

The previous prime is 2220170363. The next prime is 2220170479. The reversal of 2220170421 is 1240710222.

It is an interprime number because it is at equal distance from previous prime (2220170363) and next prime (2220170479).

It is not a de Polignac number, because 2220170421 - 2¹⁵ = 2220137653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220170021) 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, 32266 + ... + 74036.

It is an arithmetic number, because the mean of its divisors is an integer number (211533408).

Almost surely, 2^2220170421 is an apocalyptic number.

2220170421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2220170421 is a deficient number, since it is larger than the sum of its proper divisors (1164364107).

2220170421 is a wasteful number, since it uses less digits than its factorization.

2220170421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44312.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 2220170421 is about 47118.6844149961. The cubic root of 2220170421 is about 1304.5541302070.

Adding to 2220170421 its reverse (1240710222), we get a palindrome (3460880643).

The spelling of 2220170421 in words is "two billion, two hundred twenty million, one hundred seventy thousand, four hundred twenty-one".