401221142421 has 64 divisors (see below), whose sum is σ = 595007078400. Its totient is φ = 238465656000.

The previous prime is 401221142417. The next prime is 401221142429. The reversal of 401221142421 is 124241122104.

It is a happy number.

It is not a de Polignac number, because 401221142421 - 2² = 401221142417 is a prime.

It is a super-2 number, since 2×401221142421² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401221142391 and 401221142400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401221142429) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 205647996 + ... + 205649946.

It is an arithmetic number, because the mean of its divisors is an integer number (9296985600).

Almost surely, 2^401221142421 is an apocalyptic number.

It is an amenable number.

401221142421 is a deficient number, since it is larger than the sum of its proper divisors (193785935979).

401221142421 is a wasteful number, since it uses less digits than its factorization.

401221142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 401221142421 its reverse (124241122104), we get a palindrome (525462264525).

The spelling of 401221142421 in words is "four hundred one billion, two hundred twenty-one million, one hundred forty-two thousand, four hundred twenty-one".