42900221 has 32 divisors (see below), whose sum is σ = 55910400. Its totient is φ = 31990464.

The previous prime is 42900149. The next prime is 42900223. The reversal of 42900221 is 12200924.

It is a cyclic number.

It is not a de Polignac number, because 42900221 - 2¹⁸ = 42638077 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42900193 and 42900202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42900223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 215480 + ... + 215678.

It is an arithmetic number, because the mean of its divisors is an integer number (1747200).

Almost surely, 2^42900221 is an apocalyptic number.

It is an amenable number.

42900221 is a deficient number, since it is larger than the sum of its proper divisors (13010179).

42900221 is a wasteful number, since it uses less digits than its factorization.

42900221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 42900221 is about 6549.8260282240. The cubic root of 42900221 is about 350.0686151190.

The spelling of 42900221 in words is "forty-two million, nine hundred thousand, two hundred twenty-one".