401421010121 has 4 divisors (see below), whose sum is σ = 402071612052. Its totient is φ = 400770408192.

The previous prime is 401421010103. The next prime is 401421010127. The reversal of 401421010121 is 121010124104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36833286400 + 364587723721 = 191920^2 + 603811^2 .

It is a cyclic number.

It is not a de Polignac number, because 401421010121 - 2⁶ = 401421010057 is a prime.

It is a super-3 number, since 3×401421010121³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 401421010121.

It is not an unprimeable number, because it can be changed into a prime (401421010127) 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, 325300040 + ... + 325301273.

It is an arithmetic number, because the mean of its divisors is an integer number (100517903013).

Almost surely, 2^401421010121 is an apocalyptic number.

It is an amenable number.

401421010121 is a deficient number, since it is larger than the sum of its proper divisors (650601931).

401421010121 is an equidigital number, since it uses as much as digits as its factorization.

401421010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650601930.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 401421010121 its reverse (121010124104), we get a palindrome (522431134225).

The spelling of 401421010121 in words is "four hundred one billion, four hundred twenty-one million, ten thousand, one hundred twenty-one".