42121221001 has 2 divisors, whose sum is σ = 42121221002. Its totient is φ = 42121221000.

The previous prime is 42121220993. The next prime is 42121221029. The reversal of 42121221001 is 10012212124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39186182025 + 2935038976 = 197955^2 + 54176^2 .

It is a cyclic number.

It is not a de Polignac number, because 42121221001 - 2³ = 42121220993 is a prime.

It is not a weakly prime, because it can be changed into another prime (42121228001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060610500 + 21060610501.

It is an arithmetic number, because the mean of its divisors is an integer number (21060610501).

Almost surely, 2^42121221001 is an apocalyptic number.

It is an amenable number.

42121221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

42121221001 is an equidigital number, since it uses as much as digits as its factorization.

42121221001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 42121221001 its reverse (10012212124), we get a palindrome (52133433125).

The spelling of 42121221001 in words is "forty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one".