42021243 has 36 divisors (see below), whose sum is σ = 68219424. Its totient is φ = 24895200.

The previous prime is 42021241. The next prime is 42021251. The reversal of 42021243 is 34212024.

42021243 is a `hidden beast` number, since 420 + 2 + 1 + 243 = 666.

It is not a de Polignac number, because 42021243 - 2¹ = 42021241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42021241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50773 + ... + 51593.

It is an arithmetic number, because the mean of its divisors is an integer number (1894984).

Almost surely, 2^42021243 is an apocalyptic number.

42021243 is a deficient number, since it is larger than the sum of its proper divisors (26198181).

42021243 is a wasteful number, since it uses less digits than its factorization.

42021243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 42021243 is about 6482.3794242546. The cubic root of 42021243 is about 347.6612587650.

Adding to 42021243 its reverse (34212024), we get a palindrome (76233267).

It can be divided in two parts, 4202 and 1243, that added together give a palindrome (5445).

The spelling of 42021243 in words is "forty-two million, twenty-one thousand, two hundred forty-three".