42110431321621 has 8 divisors (see below), whose sum is σ = 45349940095544. Its totient is φ = 38870957522880.

The previous prime is 42110431321603. The next prime is 42110431321669. The reversal of 42110431321621 is 12612313401124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5397193190596 + 36713238131025 = 2323186^2 + 6059145^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42110431321621 - 2⁵ = 42110431321589 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 (42110431321421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6216090 + ... + 11084251.

It is an arithmetic number, because the mean of its divisors is an integer number (5668742511943).

Almost surely, 2^{42110431321621} is an apocalyptic number.

It is an amenable number.

42110431321621 is a deficient number, since it is larger than the sum of its proper divisors (3239508773923).

42110431321621 is a wasteful number, since it uses less digits than its factorization.

42110431321621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17487591.

The product of its (nonzero) digits is 6912, while the sum is 31.

Adding to 42110431321621 its reverse (12612313401124), we get a palindrome (54722744722745).

The spelling of 42110431321621 in words is "forty-two trillion, one hundred ten billion, four hundred thirty-one million, three hundred twenty-one thousand, six hundred twenty-one".