100320042121531 has 4 divisors (see below), whose sum is σ = 100322450981152. Its totient is φ = 100317633261912.

The previous prime is 100320042121501. The next prime is 100320042121549. The reversal of 100320042121531 is 135121240023001.

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

It is a cyclic number.

It is not a de Polignac number, because 100320042121531 - 2¹¹ = 100320042119483 is a prime.

It is a super-2 number, since 2×100320042121531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100320042121496 and 100320042121505.

It is not an unprimeable number, because it can be changed into a prime (100320042121501) 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, 1204367340 + ... + 1204450633.

It is an arithmetic number, because the mean of its divisors is an integer number (25080612745288).

Almost surely, 2^{100320042121531} is an apocalyptic number.

100320042121531 is a deficient number, since it is larger than the sum of its proper divisors (2408859621).

100320042121531 is an equidigital number, since it uses as much as digits as its factorization.

100320042121531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408859620.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 100320042121531 its reverse (135121240023001), we get a palindrome (235441282144532).

The spelling of 100320042121531 in words is "one hundred trillion, three hundred twenty billion, forty-two million, one hundred twenty-one thousand, five hundred thirty-one".