42220051 has 4 divisors (see below), whose sum is σ = 42264504. Its totient is φ = 42175600.

The previous prime is 42219979. The next prime is 42220081. The reversal of 42220051 is 15002224.

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

It is a cyclic number.

It is not a de Polignac number, because 42220051 - 2¹⁵ = 42187283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42220081) 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, 20770 + ... + 22711.

It is an arithmetic number, because the mean of its divisors is an integer number (10566126).

Almost surely, 2^42220051 is an apocalyptic number.

42220051 is a deficient number, since it is larger than the sum of its proper divisors (44453).

42220051 is an equidigital number, since it uses as much as digits as its factorization.

42220051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44452.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 42220051 is about 6497.6958223666. The cubic root of 42220051 is about 348.2086733452.

Adding to 42220051 its reverse (15002224), we get a palindrome (57222275).

The spelling of 42220051 in words is "forty-two million, two hundred twenty thousand, fifty-one".