423421033140221 has 4 divisors (see below), whose sum is σ = 423421305531744. Its totient is φ = 423420760748700.

The previous prime is 423421033140187. The next prime is 423421033140223. The reversal of 423421033140221 is 122041330124324.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423421033140221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423421033140223) 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, 133850615 + ... + 136977476.

It is an arithmetic number, because the mean of its divisors is an integer number (105855326382936).

Almost surely, 2^{423421033140221} is an apocalyptic number.

It is an amenable number.

423421033140221 is a deficient number, since it is larger than the sum of its proper divisors (272391523).

423421033140221 is a wasteful number, since it uses less digits than its factorization.

423421033140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272391522.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 423421033140221 its reverse (122041330124324), we get a palindrome (545462363264545).

The spelling of 423421033140221 in words is "four hundred twenty-three trillion, four hundred twenty-one billion, thirty-three million, one hundred forty thousand, two hundred twenty-one".