381221807610 has 48 divisors (see below), whose sum is σ = 1064309050656. Its totient is φ = 87136412832.

The previous prime is 381221807581. The next prime is 381221807611. The reversal of 381221807610 is 16708122183.

It is not an unprimeable number, because it can be changed into a prime (381221807611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129665812 + ... + 129668751.

It is an arithmetic number, because the mean of its divisors is an integer number (22173105222).

Almost surely, 2^381221807610 is an apocalyptic number.

381221807610 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

381221807610 is an abundant number, since it is smaller than the sum of its proper divisors (683087243046).

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

381221807610 is a wasteful number, since it uses less digits than its factorization.

381221807610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259334587 (or 259334580 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

Adding to 381221807610 its reverse (16708122183), we get a palindrome (397929929793).

The spelling of 381221807610 in words is "three hundred eighty-one billion, two hundred twenty-one million, eight hundred seven thousand, six hundred ten".