221430620757620 has 12 divisors (see below), whose sum is σ = 465004303591044. Its totient is φ = 88572248303040.

The previous prime is 221430620757569. The next prime is 221430620757667. The reversal of 221430620757620 is 26757026034122.

It can be written as a sum of positive squares in 2 ways, for example, as 150686574498916 + 70744046258704 = 12275446^2 + 8410948^2 .

It is a congruent number.

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, 5535765518921 + ... + 5535765518960.

It is an arithmetic number, because the mean of its divisors is an integer number (38750358632587).

Almost surely, 2^{221430620757620} is an apocalyptic number.

221430620757620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221430620757620 is an abundant number, since it is smaller than the sum of its proper divisors (243573682833424).

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

221430620757620 is a wasteful number, since it uses less digits than its factorization.

221430620757620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11071531037890 (or 11071531037888 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 221430620757620 in words is "two hundred twenty-one trillion, four hundred thirty billion, six hundred twenty million, seven hundred fifty-seven thousand, six hundred twenty".