221038785380 has 36 divisors (see below), whose sum is σ = 539966178108. Its totient is φ = 75784726080.

The previous prime is 221038785329. The next prime is 221038785397. The reversal of 221038785380 is 83587830122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 151705576036 + 69333209344 = 389494^2 + 263312^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112773911 + ... + 112775870.

It is an arithmetic number, because the mean of its divisors is an integer number (14999060503).

Almost surely, 2^221038785380 is an apocalyptic number.

221038785380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221038785380 is an abundant number, since it is smaller than the sum of its proper divisors (318927392728).

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

221038785380 is a wasteful number, since it uses less digits than its factorization.

221038785380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225549804 (or 225549795 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 221038785380 in words is "two hundred twenty-one billion, thirty-eight million, seven hundred eighty-five thousand, three hundred eighty".