42122234121421 has 4 divisors (see below), whose sum is σ = 42174301160700. Its totient is φ = 42070167082144.

The previous prime is 42122234121353. The next prime is 42122234121431. The reversal of 42122234121421 is 12412143222124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18369916008196 + 23752318113225 = 4286014^2 + 4873635^2 .

It is a cyclic number.

It is not a de Polignac number, because 42122234121421 - 2²¹ = 42122232024269 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 (42122234121431) 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, 26033518426 + ... + 26033520043.

It is an arithmetic number, because the mean of its divisors is an integer number (10543575290175).

Almost surely, 2^{42122234121421} is an apocalyptic number.

It is an amenable number.

42122234121421 is a deficient number, since it is larger than the sum of its proper divisors (52067039279).

42122234121421 is an equidigital number, since it uses as much as digits as its factorization.

42122234121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52067039278.

The product of its digits is 12288, while the sum is 31.

Adding to 42122234121421 its reverse (12412143222124), we get a palindrome (54534377343545).

The spelling of 42122234121421 in words is "forty-two trillion, one hundred twenty-two billion, two hundred thirty-four million, one hundred twenty-one thousand, four hundred twenty-one".