405151221 has 16 divisors (see below), whose sum is σ = 560203904. Its totient is φ = 260241984.

The previous prime is 405151181. The next prime is 405151261. The reversal of 405151221 is 122151504.

It is an interprime number because it is at equal distance from previous prime (405151181) and next prime (405151261).

It is not a de Polignac number, because 405151221 - 2⁷ = 405151093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405151261) 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, 6286 + ... + 29151.

It is an arithmetic number, because the mean of its divisors is an integer number (35012744).

Almost surely, 2^405151221 is an apocalyptic number.

It is an amenable number.

405151221 is a deficient number, since it is larger than the sum of its proper divisors (155052683).

405151221 is a wasteful number, since it uses less digits than its factorization.

405151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35580.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 405151221 is about 20128.3685628021. The cubic root of 405151221 is about 739.9556955457.

The spelling of 405151221 in words is "four hundred five million, one hundred fifty-one thousand, two hundred twenty-one".