42121007 has 2 divisors, whose sum is σ = 42121008. Its totient is φ = 42121006.

The previous prime is 42121003. The next prime is 42121067. The reversal of 42121007 is 70012124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42121007 - 2² = 42121003 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42121003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060503 + 21060504.

It is an arithmetic number, because the mean of its divisors is an integer number (21060504).

Almost surely, 2^42121007 is an apocalyptic number.

42121007 is a deficient number, since it is larger than the sum of its proper divisors (1).

42121007 is an equidigital number, since it uses as much as digits as its factorization.

42121007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 42121007 is about 6490.0698763573. The cubic root of 42121007 is about 347.9361726204.

The spelling of 42121007 in words is "forty-two million, one hundred twenty-one thousand, seven".