42821369 has 2 divisors, whose sum is σ = 42821370. Its totient is φ = 42821368.

The previous prime is 42821347. The next prime is 42821399. The reversal of 42821369 is 96312824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 13227769 = 5440^2 + 3637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42821369 is a prime.

It is a super-2 number, since 2×42821369² = 3667339286068322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42821399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21410684 + 21410685.

It is an arithmetic number, because the mean of its divisors is an integer number (21410685).

Almost surely, 2^42821369 is an apocalyptic number.

It is an amenable number.

42821369 is a deficient number, since it is larger than the sum of its proper divisors (1).

42821369 is an equidigital number, since it uses as much as digits as its factorization.

42821369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 42821369 is about 6543.8038631976. The cubic root of 42821369 is about 349.8540044154.

The spelling of 42821369 in words is "forty-two million, eight hundred twenty-one thousand, three hundred sixty-nine".