353956821 has 8 divisors (see below), whose sum is σ = 492461760. Its totient is φ = 225711552.

The previous prime is 353956819. The next prime is 353956879. The reversal of 353956821 is 128659353.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 353956821 - 2¹ = 353956819 is a prime.

It is a super-2 number, since 2×353956821² = 250570862264852082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (353956021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2564836 + ... + 2564973.

It is an arithmetic number, because the mean of its divisors is an integer number (61557720).

Almost surely, 2^353956821 is an apocalyptic number.

It is an amenable number.

353956821 is a deficient number, since it is larger than the sum of its proper divisors (138504939).

353956821 is a wasteful number, since it uses less digits than its factorization.

353956821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129835.

The product of its digits is 194400, while the sum is 42.

The square root of 353956821 is about 18813.7402182554. The cubic root of 353956821 is about 707.3756325572.

The spelling of 353956821 in words is "three hundred fifty-three million, nine hundred fifty-six thousand, eight hundred twenty-one".