220142421 has 16 divisors (see below), whose sum is σ = 328144320. Its totient is φ = 145858320.

The previous prime is 220142389. The next prime is 220142431. The reversal of 220142421 is 124241022.

220142421 is a `hidden beast` number, since 2 + 201 + 42 + 421 = 666.

It is not a de Polignac number, because 220142421 - 2⁵ = 220142389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220142394 and 220142403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220142431) 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, 20610 + ... + 29411.

It is an arithmetic number, because the mean of its divisors is an integer number (20509020).

Almost surely, 2^220142421 is an apocalyptic number.

It is an amenable number.

220142421 is a deficient number, since it is larger than the sum of its proper divisors (108001899).

220142421 is a wasteful number, since it uses less digits than its factorization.

220142421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50193 (or 50187 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 220142421 is about 14837.1972083679. The cubic root of 220142421 is about 603.8113135524.

Adding to 220142421 its reverse (124241022), we get a palindrome (344383443).

The spelling of 220142421 in words is "two hundred twenty million, one hundred forty-two thousand, four hundred twenty-one".