221311143420 has 48 divisors (see below), whose sum is σ = 620485615008. Its totient is φ = 58938741760.

The previous prime is 221311143419. The next prime is 221311143463. The reversal of 221311143420 is 24341113122.

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, 2377809 + ... + 2469128.

It is an arithmetic number, because the mean of its divisors is an integer number (12926783646).

Almost surely, 2^221311143420 is an apocalyptic number.

221311143420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221311143420 is an abundant number, since it is smaller than the sum of its proper divisors (399174471588).

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

221311143420 is a wasteful number, since it uses less digits than its factorization.

221311143420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847710 (or 4847708 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 221311143420 its reverse (24341113122), we get a palindrome (245652256542).

The spelling of 221311143420 in words is "two hundred twenty-one billion, three hundred eleven million, one hundred forty-three thousand, four hundred twenty".