42120232021 has 4 divisors (see below), whose sum is σ = 48137408032. Its totient is φ = 36103056012.

The previous prime is 42120231961. The next prime is 42120232039. The reversal of 42120232021 is 12023202124.

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-42120232021 is a prime.

It is a super-2 number, since 2×42120232021² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42120232021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120230021) 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, 3008587995 + ... + 3008588008.

It is an arithmetic number, because the mean of its divisors is an integer number (12034352008).

Almost surely, 2^42120232021 is an apocalyptic number.

It is an amenable number.

42120232021 is a deficient number, since it is larger than the sum of its proper divisors (6017176011).

42120232021 is an equidigital number, since it uses as much as digits as its factorization.

42120232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6017176010.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 42120232021 its reverse (12023202124), we get a palindrome (54143434145).

The spelling of 42120232021 in words is "forty-two billion, one hundred twenty million, two hundred thirty-two thousand, twenty-one".