3251421820018 has 4 divisors (see below), whose sum is σ = 4877132730030. Its totient is φ = 1625710910008.

The previous prime is 3251421819959. The next prime is 3251421820019. The reversal of 3251421820018 is 8100281241523.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 2926381584889 + 325040235129 = 1710667^2 + 570123^2 .

It is not an unprimeable number, because it can be changed into a prime (3251421820019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812855455003 + ... + 812855455006.

Almost surely, 2^{3251421820018} is an apocalyptic number.

3251421820018 is a deficient number, since it is larger than the sum of its proper divisors (1625710910012).

3251421820018 is a wasteful number, since it uses less digits than its factorization.

3251421820018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625710910011.

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 3251421820018 in words is "three trillion, two hundred fifty-one billion, four hundred twenty-one million, eight hundred twenty thousand, eighteen".