345663021 has 16 divisors (see below), whose sum is σ = 524643840. Its totient is φ = 200383920.

The previous prime is 345663011. The next prime is 345663041. The reversal of 345663021 is 120366543.

It is not a de Polignac number, because 345663021 - 2²² = 341468717 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 345663021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345663001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226951 + ... + 228468.

It is an arithmetic number, because the mean of its divisors is an integer number (32790240).

Almost surely, 2^345663021 is an apocalyptic number.

It is an amenable number.

345663021 is a deficient number, since it is larger than the sum of its proper divisors (178980819).

345663021 is a wasteful number, since it uses less digits than its factorization.

345663021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455456.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 345663021 is about 18592.0149795551. The cubic root of 345663021 is about 701.8069107179.

It can be divided in two parts, 345 and 663021, that added together give a palindrome (663366).

The spelling of 345663021 in words is "three hundred forty-five million, six hundred sixty-three thousand, twenty-one".