42150021 has 16 divisors (see below), whose sum is σ = 61560000. Its totient is φ = 25534208.

The previous prime is 42150011. The next prime is 42150029. The reversal of 42150021 is 12005124.

It is a cyclic number.

It is not a de Polignac number, because 42150021 - 2⁹ = 42149509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42150029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12771 + ... + 15728.

It is an arithmetic number, because the mean of its divisors is an integer number (3847500).

Almost surely, 2^42150021 is an apocalyptic number.

It is an amenable number.

42150021 is a deficient number, since it is larger than the sum of its proper divisors (19409979).

42150021 is a wasteful number, since it uses less digits than its factorization.

42150021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28548.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 42150021 is about 6492.3047525513. The cubic root of 42150021 is about 348.0160433217.

Adding to 42150021 its reverse (12005124), we get a palindrome (54155145).

The spelling of 42150021 in words is "forty-two million, one hundred fifty thousand, twenty-one".