42101012021 has 4 divisors (see below), whose sum is σ = 42169027200. Its totient is φ = 42032996844.

The previous prime is 42101012017. The next prime is 42101012027. The reversal of 42101012021 is 12021010124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42101012021 - 2² = 42101012017 is a prime.

It is a super-3 number, since 3×42101012021³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42101011987 and 42101012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42101012027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34006661 + ... + 34007898.

It is an arithmetic number, because the mean of its divisors is an integer number (10542256800).

Almost surely, 2^42101012021 is an apocalyptic number.

It is an amenable number.

42101012021 is a deficient number, since it is larger than the sum of its proper divisors (68015179).

42101012021 is an equidigital number, since it uses as much as digits as its factorization.

42101012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68015178.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 42101012021 its reverse (12021010124), we get a palindrome (54122022145).

The spelling of 42101012021 in words is "forty-two billion, one hundred one million, twelve thousand, twenty-one".