221421251727240 has 64 divisors (see below), whose sum is σ = 673363258704000. Its totient is φ = 58236822369792.

The previous prime is 221421251727217. The next prime is 221421251727337. The reversal of 221421251727240 is 42727152124122.

It is a junction number, because it is equal to n+sod(n) for n = 221421251727192 and 221421251727201.

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, 12638190540 + ... + 12638208059.

It is an arithmetic number, because the mean of its divisors is an integer number (10521300917250).

Almost surely, 2^{221421251727240} is an apocalyptic number.

221421251727240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421251727240 is an abundant number, since it is smaller than the sum of its proper divisors (451942006976760).

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

221421251727240 is a wasteful number, since it uses less digits than its factorization.

221421251727240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25276398686 (or 25276398682 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 42.

The spelling of 221421251727240 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred twenty-seven thousand, two hundred forty".