221421251703440 has 20 divisors (see below), whose sum is σ = 514804410210684. Its totient is φ = 88568500681344.

The previous prime is 221421251703437. The next prime is 221421251703451. The reversal of 221421251703440 is 44307152124122.

It can be written as a sum of positive squares in 2 ways, for example, as 70256784052624 + 151164467650816 = 8381932^2 + 12294896^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×221421251703440² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221421251703394 and 221421251703403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383882823067 + ... + 1383882823226.

Almost surely, 2^{221421251703440} is an apocalyptic number.

221421251703440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421251703440 is an abundant number, since it is smaller than the sum of its proper divisors (293383158507244).

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

221421251703440 is a wasteful number, since it uses less digits than its factorization.

221421251703440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2767765646306 (or 2767765646300 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 38.

The spelling of 221421251703440 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred three thousand, four hundred forty".