1621228110 has 64 divisors (see below), whose sum is σ = 3981602304. Its totient is φ = 422352000.

The previous prime is 1621228099. The next prime is 1621228123. The reversal of 1621228110 is 118221261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273397 + ... + 279263.

It is an arithmetic number, because the mean of its divisors is an integer number (62212536).

Almost surely, 2^1621228110 is an apocalyptic number.

1621228110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621228110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1990801152).

1621228110 is an abundant number, since it is smaller than the sum of its proper divisors (2360374194).

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

1621228110 is a wasteful number, since it uses less digits than its factorization.

1621228110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1621228110 is about 40264.4770237985. The cubic root of 1621228110 is about 1174.7570006018.

Adding to 1621228110 its reverse (118221261), we get a palindrome (1739449371).

The spelling of 1621228110 in words is "one billion, six hundred twenty-one million, two hundred twenty-eight thousand, one hundred ten".