3205421520 has 80 divisors (see below), whose sum is σ = 11356356480. Its totient is φ = 732667392.

The previous prime is 3205421501. The next prime is 3205421539. The reversal of 3205421520 is 251245023.

It is an interprime number because it is at equal distance from previous prime (3205421501) and next prime (3205421539).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×3205421520² = 20549454241758220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 952315 + ... + 955674.

It is an arithmetic number, because the mean of its divisors is an integer number (141954456).

Almost surely, 2^3205421520 is an apocalyptic number.

3205421520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3205421520 is an abundant number, since it is smaller than the sum of its proper divisors (8150934960).

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

3205421520 is a wasteful number, since it uses less digits than its factorization.

3205421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908012 (or 1908006 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 3205421520 is about 56616.4421347721. The cubic root of 3205421520 is about 1474.4443403496. Note that the first 3 decimals are identical.

Adding to 3205421520 its reverse (251245023), we get a palindrome (3456666543).

The spelling of 3205421520 in words is "three billion, two hundred five million, four hundred twenty-one thousand, five hundred twenty".