42211531 has 2 divisors, whose sum is σ = 42211532. Its totient is φ = 42211530.

The previous prime is 42211529. The next prime is 42211537. The reversal of 42211531 is 13511224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42211531 - 2¹ = 42211529 is a prime.

It is a super-2 number, since 2×42211531² = 3563626698727922, which contains 22 as substring.

Together with 42211529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 42211499 and 42211508.

It is not a weakly prime, because it can be changed into another prime (42211537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21105765 + 21105766.

It is an arithmetic number, because the mean of its divisors is an integer number (21105766).

Almost surely, 2^42211531 is an apocalyptic number.

42211531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42211531 is an equidigital number, since it uses as much as digits as its factorization.

42211531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 19.

The square root of 42211531 is about 6497.0401722631. The cubic root of 42211531 is about 348.1852489500.

Adding to 42211531 its reverse (13511224), we get a palindrome (55722755).

The spelling of 42211531 in words is "forty-two million, two hundred eleven thousand, five hundred thirty-one".