220420400421 has 16 divisors (see below), whose sum is σ = 316535063936. Its totient is φ = 135628762176.

The previous prime is 220420400413. The next prime is 220420400423. The reversal of 220420400421 is 124004024022.

It is not a de Polignac number, because 220420400421 - 2³ = 220420400413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220420400423) 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, 70431 + ... + 667683.

It is an arithmetic number, because the mean of its divisors is an integer number (19783441496).

Almost surely, 2^220420400421 is an apocalyptic number.

It is an amenable number.

220420400421 is a deficient number, since it is larger than the sum of its proper divisors (96114663515).

220420400421 is a wasteful number, since it uses less digits than its factorization.

220420400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606732.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 220420400421 its reverse (124004024022), we get a palindrome (344424424443).

The spelling of 220420400421 in words is "two hundred twenty billion, four hundred twenty million, four hundred thousand, four hundred twenty-one".