42121069 has 4 divisors (see below), whose sum is σ = 42190396. Its totient is φ = 42051744.

The previous prime is 42121067. The next prime is 42121097. The reversal of 42121069 is 96012124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5579044 + 36542025 = 2362^2 + 6045^2 .

It is a cyclic number.

It is not a de Polignac number, because 42121069 - 2¹ = 42121067 is a prime.

It is a super-2 number, since 2×42121069² = 3548368907405522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121067) 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, 33744 + ... + 34969.

It is an arithmetic number, because the mean of its divisors is an integer number (10547599).

Almost surely, 2^42121069 is an apocalyptic number.

It is an amenable number.

42121069 is a deficient number, since it is larger than the sum of its proper divisors (69327).

42121069 is an equidigital number, since it uses as much as digits as its factorization.

42121069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69326.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 42121069 is about 6490.0746528834. The cubic root of 42121069 is about 347.9363433352.

The spelling of 42121069 in words is "forty-two million, one hundred twenty-one thousand, sixty-nine".