1621093120 has 72 divisors (see below), whose sum is σ = 3973462416. Its totient is φ = 633335808.

The previous prime is 1621093093. The next prime is 1621093171. The reversal of 1621093120 is 213901261.

It is a super-2 number, since 2×1621093120² = 5255885807422668800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40314 + ... + 69766.

It is an arithmetic number, because the mean of its divisors is an integer number (55186978).

Almost surely, 2^1621093120 is an apocalyptic number.

1621093120 is a gapful number since it is divisible by the number (10) 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 1621093120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1986731208).

1621093120 is an abundant number, since it is smaller than the sum of its proper divisors (2352369296).

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

1621093120 is an equidigital number, since it uses as much as digits as its factorization.

1621093120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29517 (or 29503 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1621093120 is about 40262.8006974180. The cubic root of 1621093120 is about 1174.7243946927.

Adding to 1621093120 its reverse (213901261), we get a palindrome (1834994381).

The spelling of 1621093120 in words is "one billion, six hundred twenty-one million, ninety-three thousand, one hundred twenty".