42111621 has 6 divisors (see below), whose sum is σ = 60827910. Its totient is φ = 28074408.

The previous prime is 42111611. The next prime is 42111623. The reversal of 42111621 is 12611124.

42111621 is a `hidden beast` number, since 42 + 1 + 1 + 1 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 37380996 + 4730625 = 6114^2 + 2175^2 .

It is not a de Polignac number, because 42111621 - 2⁷ = 42111493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42111594 and 42111603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42111623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2339526 + ... + 2339543.

It is an arithmetic number, because the mean of its divisors is an integer number (10137985).

Almost surely, 2^42111621 is an apocalyptic number.

It is an amenable number.

42111621 is a deficient number, since it is larger than the sum of its proper divisors (18716289).

42111621 is a wasteful number, since it uses less digits than its factorization.

42111621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679075 (or 4679072 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 42111621 is about 6489.3467313744. The cubic root of 42111621 is about 347.9103266768.

Adding to 42111621 its reverse (12611124), we get a palindrome (54722745).

It can be divided in two parts, 4211 and 1621, that added together give a cube (5832 = 18³).

The spelling of 42111621 in words is "forty-two million, one hundred eleven thousand, six hundred twenty-one".