420430400321221 has 4 divisors (see below), whose sum is σ = 420432750625612. Its totient is φ = 420428050016832.

The previous prime is 420430400321219. The next prime is 420430400321231. The reversal of 420430400321221 is 122123004034024.

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 47872422620100 + 372557977701121 = 6918990^2 + 19301761^2 .

It is a cyclic number.

It is not a de Polignac number, because 420430400321221 - 2¹ = 420430400321219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420430400321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420430400321231) 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, 1174883850 + ... + 1175241643.

It is an arithmetic number, because the mean of its divisors is an integer number (105108187656403).

Almost surely, 2^{420430400321221} is an apocalyptic number.

It is an amenable number.

420430400321221 is a deficient number, since it is larger than the sum of its proper divisors (2350304391).

420430400321221 is a wasteful number, since it uses less digits than its factorization.

420430400321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350304390.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 420430400321221 its reverse (122123004034024), we get a palindrome (542553404355245).

The spelling of 420430400321221 in words is "four hundred twenty trillion, four hundred thirty billion, four hundred million, three hundred twenty-one thousand, two hundred twenty-one".