420400231121 has 4 divisors (see below), whose sum is σ = 452738710452. Its totient is φ = 388061751792.

The previous prime is 420400231117. The next prime is 420400231201. The reversal of 420400231121 is 121132004024.

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 270816160000 + 149584071121 = 520400^2 + 386761^2 .

It is not a de Polignac number, because 420400231121 - 2² = 420400231117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420400231093 and 420400231102.

It is not an unprimeable number, because it can be changed into a prime (420400231621) 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, 16169239646 + ... + 16169239671.

It is an arithmetic number, because the mean of its divisors is an integer number (113184677613).

Almost surely, 2^420400231121 is an apocalyptic number.

It is an amenable number.

420400231121 is a deficient number, since it is larger than the sum of its proper divisors (32338479331).

420400231121 is a wasteful number, since it uses less digits than its factorization.

420400231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32338479330.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 420400231121 its reverse (121132004024), we get a palindrome (541532235145).

The spelling of 420400231121 in words is "four hundred twenty billion, four hundred million, two hundred thirty-one thousand, one hundred twenty-one".