421211434021 has 4 divisors (see below), whose sum is σ = 481384496032. Its totient is φ = 361038372012.

The previous prime is 421211433983. The next prime is 421211434031. The reversal of 421211434021 is 120434112124.

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 not a de Polignac number, because 421211434021 - 2⁷ = 421211433893 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 (421211434031) 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, 30086530995 + ... + 30086531008.

It is an arithmetic number, because the mean of its divisors is an integer number (120346124008).

Almost surely, 2^421211434021 is an apocalyptic number.

It is an amenable number.

421211434021 is a deficient number, since it is larger than the sum of its proper divisors (60173062011).

421211434021 is an equidigital number, since it uses as much as digits as its factorization.

421211434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60173062010.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 421211434021 its reverse (120434112124), we get a palindrome (541645546145).

The spelling of 421211434021 in words is "four hundred twenty-one billion, two hundred eleven million, four hundred thirty-four thousand, twenty-one".