42121055 has 4 divisors (see below), whose sum is σ = 50545272. Its totient is φ = 33696840.

The previous prime is 42121007. The next prime is 42121067. The reversal of 42121055 is 55012124.

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

It is not a de Polignac number, because 42121055 - 2¹² = 42116959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4212101 + ... + 4212110.

It is an arithmetic number, because the mean of its divisors is an integer number (12636318).

Almost surely, 2^42121055 is an apocalyptic number.

42121055 is a deficient number, since it is larger than the sum of its proper divisors (8424217).

42121055 is an equidigital number, since it uses as much as digits as its factorization.

42121055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8424216.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42121055 is about 6490.0735743133. The cubic root of 42121055 is about 347.9363047867.

Adding to 42121055 its reverse (55012124), we get a palindrome (97133179).

It can be divided in two parts, 421 and 21055, that multiplied together give a triangular number (8864155 = T₄₂₁₀).

The spelling of 42121055 in words is "forty-two million, one hundred twenty-one thousand, fifty-five".