355121020 has 48 divisors (see below), whose sum is σ = 787046400. Its totient is φ = 134222400.

The previous prime is 355120999. The next prime is 355121021. The reversal of 355121020 is 20121553.

It is a super-2 number, since 2×355121020² = 252221877691680800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181045 + ... + 182995.

It is an arithmetic number, because the mean of its divisors is an integer number (16396800).

Almost surely, 2^355121020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 355121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (393523200).

355121020 is an abundant number, since it is smaller than the sum of its proper divisors (431925380).

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

355121020 is a wasteful number, since it uses less digits than its factorization.

355121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 355121020 is about 18844.6549451031. The cubic root of 355121020 is about 708.1503266397.

Adding to 355121020 its reverse (20121553), we get a palindrome (375242573).

The spelling of 355121020 in words is "three hundred fifty-five million, one hundred twenty-one thousand, twenty".