42212691 has 8 divisors (see below), whose sum is σ = 62537360. Its totient is φ = 28141776.

The previous prime is 42212689. The next prime is 42212701. The reversal of 42212691 is 19621224.

It is not a de Polignac number, because 42212691 - 2¹ = 42212689 is a prime.

It is a super-2 number, since 2×42212691² = 3563822562922962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1563433 = 42212691 / (4 + 2 + 2 + 1 + 2 + 6 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42232691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781690 + ... + 781743.

It is an arithmetic number, because the mean of its divisors is an integer number (7817170).

Almost surely, 2^42212691 is an apocalyptic number.

42212691 is a deficient number, since it is larger than the sum of its proper divisors (20324669).

42212691 is a wasteful number, since it uses less digits than its factorization.

42212691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563442 (or 1563436 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 42212691 is about 6497.1294430695. The cubic root of 42212691 is about 348.1884383722.

The spelling of 42212691 in words is "forty-two million, two hundred twelve thousand, six hundred ninety-one".