340021221 has 4 divisors (see below), whose sum is σ = 453361632. Its totient is φ = 226680812.

The previous prime is 340021183. The next prime is 340021229. The reversal of 340021221 is 122120043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 340021221 - 2²² = 335826917 is a prime.

It is a super-2 number, since 2×340021221² = 231228861460661682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 340021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340021229) 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, 56670201 + ... + 56670206.

It is an arithmetic number, because the mean of its divisors is an integer number (113340408).

Almost surely, 2^340021221 is an apocalyptic number.

It is an amenable number.

340021221 is a deficient number, since it is larger than the sum of its proper divisors (113340411).

340021221 is a wasteful number, since it uses less digits than its factorization.

340021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113340410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 340021221 is about 18439.6643407628. The cubic root of 340021221 is about 697.9677252368.

Adding to 340021221 its reverse (122120043), we get a palindrome (462141264).

The spelling of 340021221 in words is "three hundred forty million, twenty-one thousand, two hundred twenty-one".