42212155 has 8 divisors (see below), whose sum is σ = 50778000. Its totient is φ = 33687456.

The previous prime is 42212143. The next prime is 42212171. The reversal of 42212155 is 55121224.

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 42212155 - 2⁹ = 42211643 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7980 + ... + 12169.

It is an arithmetic number, because the mean of its divisors is an integer number (6347250).

Almost surely, 2^42212155 is an apocalyptic number.

42212155 is a deficient number, since it is larger than the sum of its proper divisors (8565845).

42212155 is a wasteful number, since it uses less digits than its factorization.

42212155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20573.

The product of its digits is 800, while the sum is 22.

The square root of 42212155 is about 6497.0881939527. The cubic root of 42212155 is about 348.1869646465.

Adding to 42212155 its reverse (55121224), we get a palindrome (97333379).

The spelling of 42212155 in words is "forty-two million, two hundred twelve thousand, one hundred fifty-five".