421011223220 has 144 divisors (see below), whose sum is σ = 1060034931648. Its totient is φ = 139959912960.

The previous prime is 421011223187. The next prime is 421011223249. The reversal of 421011223220 is 22322110124.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 421011223192 and 421011223201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6517199 + ... + 6581481.

It is an arithmetic number, because the mean of its divisors is an integer number (7361353692).

Almost surely, 2^421011223220 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 421011223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530017465824).

421011223220 is an abundant number, since it is smaller than the sum of its proper divisors (639023708428).

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

421011223220 is a wasteful number, since it uses less digits than its factorization.

421011223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64510 (or 64501 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 421011223220 its reverse (22322110124), we get a palindrome (443333333344).

The spelling of 421011223220 in words is "four hundred twenty-one billion, eleven million, two hundred twenty-three thousand, two hundred twenty".