221271347220 has 648 divisors, whose sum is σ = 836561773152. Its totient is φ = 43533262080.

The previous prime is 221271347179. The next prime is 221271347237. The reversal of 221271347220 is 22743172122.

It is a super-2 number, since 2×221271347220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 128421279 + ... + 128423001.

Almost surely, 2^221271347220 is an apocalyptic number.

221271347220 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 221271347220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418280886576).

221271347220 is an abundant number, since it is smaller than the sum of its proper divisors (615290425932).

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

221271347220 is a wasteful number, since it uses less digits than its factorization.

221271347220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809 (or 1770 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The spelling of 221271347220 in words is "two hundred twenty-one billion, two hundred seventy-one million, three hundred forty-seven thousand, two hundred twenty".