336021391 has 4 divisors (see below), whose sum is σ = 336541392. Its totient is φ = 335501392.

The previous prime is 336021359. The next prime is 336021397. The reversal of 336021391 is 193120633.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193120633 = 521 ⋅370673.

It is a cyclic number.

It is not a de Polignac number, because 336021391 - 2⁵ = 336021359 is a prime.

It is a super-2 number, since 2×336021391² = 225820750419149762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (336021397) 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, 259030 + ... + 260323.

It is an arithmetic number, because the mean of its divisors is an integer number (84135348).

Almost surely, 2^336021391 is an apocalyptic number.

336021391 is a deficient number, since it is larger than the sum of its proper divisors (520001).

336021391 is an equidigital number, since it uses as much as digits as its factorization.

336021391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520000.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 336021391 is about 18330.8862578982. The cubic root of 336021391 is about 695.2200817765.

The spelling of 336021391 in words is "three hundred thirty-six million, twenty-one thousand, three hundred ninety-one".