221423021240 has 64 divisors (see below), whose sum is σ = 520469798400. Its totient is φ = 84619446912.

The previous prime is 221423021227. The next prime is 221423021269. The reversal of 221423021240 is 42120324122.

It is a super-2 number, since 2×221423021240² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650189 + ... + 930371.

It is an arithmetic number, because the mean of its divisors is an integer number (8132340600).

Almost surely, 2^221423021240 is an apocalyptic number.

221423021240 is a gapful number since it is divisible by the number (20) 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 221423021240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260234899200).

221423021240 is an abundant number, since it is smaller than the sum of its proper divisors (299046777160).

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

221423021240 is a wasteful number, since it uses less digits than its factorization.

221423021240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281076 (or 281072 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221423021240 its reverse (42120324122), we get a palindrome (263543345362).

The spelling of 221423021240 in words is "two hundred twenty-one billion, four hundred twenty-three million, twenty-one thousand, two hundred forty".