401421420021 has 16 divisors (see below), whose sum is σ = 574028648640. Its totient is φ = 248745744000.

The previous prime is 401421419977. The next prime is 401421420047. The reversal of 401421420021 is 120024124104.

It is not a de Polignac number, because 401421420021 - 2¹³ = 401421411829 is a prime.

It is a super-2 number, since 2×401421420021² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401421420021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401421421021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66435480 + ... + 66441521.

It is an arithmetic number, because the mean of its divisors is an integer number (35876790540).

Almost surely, 2^401421420021 is an apocalyptic number.

It is an amenable number.

401421420021 is a deficient number, since it is larger than the sum of its proper divisors (172607228619).

401421420021 is a wasteful number, since it uses less digits than its factorization.

401421420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132877076.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 401421420021 its reverse (120024124104), we get a palindrome (521445544125).

The spelling of 401421420021 in words is "four hundred one billion, four hundred twenty-one million, four hundred twenty thousand, twenty-one".