42120123443221 has 16 divisors (see below), whose sum is σ = 43214441292288. Its totient is φ = 41029032643200.

The previous prime is 42120123443191. The next prime is 42120123443273. The reversal of 42120123443221 is 12234432102124.

It is a cyclic number.

It is not a de Polignac number, because 42120123443221 - 2⁷ = 42120123443093 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 (42120123446221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92346036 + ... + 92801026.

It is an arithmetic number, because the mean of its divisors is an integer number (2700902580768).

Almost surely, 2^{42120123443221} is an apocalyptic number.

42120123443221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42120123443221 is a deficient number, since it is larger than the sum of its proper divisors (1094317849067).

42120123443221 is a wasteful number, since it uses less digits than its factorization.

42120123443221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458532.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 42120123443221 its reverse (12234432102124), we get a palindrome (54354555545345).

The spelling of 42120123443221 in words is "forty-two trillion, one hundred twenty billion, one hundred twenty-three million, four hundred forty-three thousand, two hundred twenty-one".