421151221 has 8 divisors (see below), whose sum is σ = 433238400. Its totient is φ = 409150560.

The previous prime is 421151209. The next prime is 421151233. The reversal of 421151221 is 122151124.

It is an interprime number because it is at equal distance from previous prime (421151209) and next prime (421151233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421151221 - 2⁵ = 421151189 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 (421151201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11691 + ... + 31288.

It is an arithmetic number, because the mean of its divisors is an integer number (54154800).

Almost surely, 2^421151221 is an apocalyptic number.

421151221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

421151221 is a deficient number, since it is larger than the sum of its proper divisors (12087179).

421151221 is a wasteful number, since it uses less digits than its factorization.

421151221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43259.

The product of its digits is 160, while the sum is 19.

The square root of 421151221 is about 20521.9692281223. The cubic root of 421151221 is about 749.5708484113.

It can be divided in two parts, 42115 and 1221, that multiplied together give a palindrome (51422415).

The spelling of 421151221 in words is "four hundred twenty-one million, one hundred fifty-one thousand, two hundred twenty-one".