421661031240 has 128 divisors (see below), whose sum is σ = 1309119926400. Its totient is φ = 108522731520.

The previous prime is 421661031227. The next prime is 421661031251. The reversal of 421661031240 is 42130166124.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 421661031198 and 421661031207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9314260 + ... + 9359420.

It is an arithmetic number, because the mean of its divisors is an integer number (10227499425).

Almost surely, 2^421661031240 is an apocalyptic number.

421661031240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421661031240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (654559963200).

421661031240 is an abundant number, since it is smaller than the sum of its proper divisors (887458895160).

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

421661031240 is a wasteful number, since it uses less digits than its factorization.

421661031240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47887 (or 47883 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 421661031240 its reverse (42130166124), we get a palindrome (463791197364).

The spelling of 421661031240 in words is "four hundred twenty-one billion, six hundred sixty-one million, thirty-one thousand, two hundred forty".