351061021 has 4 divisors (see below), whose sum is σ = 351525532. Its totient is φ = 350596512.

The previous prime is 351061013. The next prime is 351061027. The reversal of 351061021 is 120160153.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134235396 + 216825625 = 11586^2 + 14725^2 .

It is a cyclic number.

It is not a de Polignac number, because 351061021 - 2³ = 351061013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 351061021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351061027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231120 + ... + 232633.

It is an arithmetic number, because the mean of its divisors is an integer number (87881383).

Almost surely, 2^351061021 is an apocalyptic number.

It is an amenable number.

351061021 is a deficient number, since it is larger than the sum of its proper divisors (464511).

351061021 is an equidigital number, since it uses as much as digits as its factorization.

351061021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464510.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 351061021 is about 18736.6224544340. The cubic root of 351061021 is about 705.4412816667.

The spelling of 351061021 in words is "three hundred fifty-one million, sixty-one thousand, twenty-one".