1405020221 has 4 divisors (see below), whose sum is σ = 1532749344. Its totient is φ = 1277291100.

The previous prime is 1405020193. The next prime is 1405020241. The reversal of 1405020221 is 1220205041.

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 1405020221 - 2⁶ = 1405020157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1405020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405020241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63864545 + ... + 63864566.

It is an arithmetic number, because the mean of its divisors is an integer number (383187336).

Almost surely, 2^1405020221 is an apocalyptic number.

1405020221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1405020221 is a deficient number, since it is larger than the sum of its proper divisors (127729123).

1405020221 is a wasteful number, since it uses less digits than its factorization.

1405020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127729122.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1405020221 is about 37483.5993602535. The cubic root of 1405020221 is about 1120.0245054693.

Adding to 1405020221 its reverse (1220205041), we get a palindrome (2625225262).

The spelling of 1405020221 in words is "one billion, four hundred five million, twenty thousand, two hundred twenty-one".