421202042430221 has 16 divisors (see below), whose sum is σ = 477477233150400. Its totient is φ = 368337676537728.

The previous prime is 421202042430173. The next prime is 421202042430223. The reversal of 421202042430221 is 122034240202124.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421202042430221 is a prime.

It is a super-2 number, since 2×421202042430221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421202042430223) 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, 103919390 + ... + 107896448.

It is an arithmetic number, because the mean of its divisors is an integer number (29842327071900).

Almost surely, 2^{421202042430221} is an apocalyptic number.

It is an amenable number.

421202042430221 is a deficient number, since it is larger than the sum of its proper divisors (56275190720179).

421202042430221 is a wasteful number, since it uses less digits than its factorization.

421202042430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405868.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 421202042430221 its reverse (122034240202124), we get a palindrome (543236282632345).

The spelling of 421202042430221 in words is "four hundred twenty-one trillion, two hundred two billion, forty-two million, four hundred thirty thousand, two hundred twenty-one".