42021653 has 4 divisors (see below), whose sum is σ = 42036588. Its totient is φ = 42006720.

The previous prime is 42021641. The next prime is 42021689. The reversal of 42021653 is 35612024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19201924 + 22819729 = 4382^2 + 4777^2 .

It is a cyclic number.

It is not a de Polignac number, because 42021653 - 2⁶ = 42021589 is a prime.

It is a super-4 number, since 4×42021653⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42021613) 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, 1826 + ... + 9347.

It is an arithmetic number, because the mean of its divisors is an integer number (10509147).

Almost surely, 2^42021653 is an apocalyptic number.

It is an amenable number.

42021653 is a deficient number, since it is larger than the sum of its proper divisors (14935).

42021653 is a wasteful number, since it uses less digits than its factorization.

42021653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 42021653 is about 6482.4110483677. The cubic root of 42021653 is about 347.6623894681.

Adding to 42021653 its reverse (35612024), we get a palindrome (77633677).

The spelling of 42021653 in words is "forty-two million, twenty-one thousand, six hundred fifty-three".