401221142420 has 192 divisors, whose sum is σ = 1024243852800. Its totient is φ = 131840400384.

The previous prime is 401221142417. The next prime is 401221142429. The reversal of 401221142420 is 24241122104.

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, 16994144 + ... + 17017736.

It is an arithmetic number, because the mean of its divisors is an integer number (5334603400).

Almost surely, 2^401221142420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401221142420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512121926400).

401221142420 is an abundant number, since it is smaller than the sum of its proper divisors (623022710380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401221142420 is a wasteful number, since it uses less digits than its factorization.

401221142420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23727 (or 23711 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 401221142420 its reverse (24241122104), we get a palindrome (425462264524).

The spelling of 401221142420 in words is "four hundred one billion, two hundred twenty-one million, one hundred forty-two thousand, four hundred twenty".