42153121 has 2 divisors, whose sum is σ = 42153122. Its totient is φ = 42153120.

The previous prime is 42153071. The next prime is 42153131. The reversal of 42153121 is 12135124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41422096 + 731025 = 6436^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 42153121 - 2¹¹ = 42151073 is a prime.

It is a super-2 number, since 2×42153121² = 3553771220081282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42153131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21076560 + 21076561.

It is an arithmetic number, because the mean of its divisors is an integer number (21076561).

Almost surely, 2^42153121 is an apocalyptic number.

It is an amenable number.

42153121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42153121 is an equidigital number, since it uses as much as digits as its factorization.

42153121 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 42153121 is about 6492.5434923457. The cubic root of 42153121 is about 348.0245749369.

Adding to 42153121 its reverse (12135124), we get a palindrome (54288245).

The spelling of 42153121 in words is "forty-two million, one hundred fifty-three thousand, one hundred twenty-one".