331011421 has 12 divisors (see below), whose sum is σ = 359106132. Its totient is φ = 303308928.

The previous prime is 331011389. The next prime is 331011427. The reversal of 331011421 is 124110133.

It can be written as a sum of positive squares in 6 ways, for example, as 3944196 + 327067225 = 1986^2 + 18085^2 .

It is not a de Polignac number, because 331011421 - 2⁵ = 331011389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331011395 and 331011404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331011427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 319921 + ... + 320953.

It is an arithmetic number, because the mean of its divisors is an integer number (29925511).

Almost surely, 2^331011421 is an apocalyptic number.

It is an amenable number.

331011421 is a deficient number, since it is larger than the sum of its proper divisors (28094711).

331011421 is a wasteful number, since it uses less digits than its factorization.

331011421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 331011421 is about 18193.7192734196. The cubic root of 331011421 is about 691.7475976202.

Adding to 331011421 its reverse (124110133), we get a palindrome (455121554).

The spelling of 331011421 in words is "three hundred thirty-one million, eleven thousand, four hundred twenty-one".