421320343012021 has 4 divisors (see below), whose sum is σ = 425410831779232. Its totient is φ = 417229854244812.

The previous prime is 421320343011941. The next prime is 421320343012033. The reversal of 421320343012021 is 120210343023124.

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-421320343012021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421320343012091) 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, 2045244383451 + ... + 2045244383656.

It is an arithmetic number, because the mean of its divisors is an integer number (106352707944808).

Almost surely, 2^{421320343012021} is an apocalyptic number.

It is an amenable number.

421320343012021 is a deficient number, since it is larger than the sum of its proper divisors (4090488767211).

421320343012021 is a wasteful number, since it uses less digits than its factorization.

421320343012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090488767210.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 421320343012021 its reverse (120210343023124), we get a palindrome (541530686035145).

The spelling of 421320343012021 in words is "four hundred twenty-one trillion, three hundred twenty billion, three hundred forty-three million, twelve thousand, twenty-one".