220122421 has 4 divisors (see below), whose sum is σ = 221729292. Its totient is φ = 218515552.

The previous prime is 220122407. The next prime is 220122437. The reversal of 220122421 is 124221022.

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 190026225 + 30096196 = 13785^2 + 5486^2 .

It is a cyclic number.

It is not a de Polignac number, because 220122421 - 2⁵ = 220122389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220122395 and 220122404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220128421) 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, 803230 + ... + 803503.

It is an arithmetic number, because the mean of its divisors is an integer number (55432323).

Almost surely, 2^220122421 is an apocalyptic number.

It is an amenable number.

220122421 is a deficient number, since it is larger than the sum of its proper divisors (1606871).

220122421 is a wasteful number, since it uses less digits than its factorization.

220122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606870.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 220122421 is about 14836.5232113187. The cubic root of 220122421 is about 603.7930275236.

Adding to 220122421 its reverse (124221022), we get a palindrome (344343443).

The spelling of 220122421 in words is "two hundred twenty million, one hundred twenty-two thousand, four hundred twenty-one".