420175621 has 8 divisors (see below), whose sum is σ = 445124160. Its totient is φ = 395252928.

The previous prime is 420175619. The next prime is 420175699. The reversal of 420175621 is 126571024.

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 420175621 - 2¹ = 420175619 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 420175621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420175601) 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, 34480 + ... + 45046.

It is an arithmetic number, because the mean of its divisors is an integer number (55640520).

Almost surely, 2^420175621 is an apocalyptic number.

It is an amenable number.

420175621 is a deficient number, since it is larger than the sum of its proper divisors (24948539).

420175621 is a wasteful number, since it uses less digits than its factorization.

420175621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12923.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 420175621 is about 20498.1857977724. The cubic root of 420175621 is about 748.9916053873.

It can be divided in two parts, 4201 and 75621, that multiplied together give a triangular number (317683821 = T₂₅₂₀₆).

The spelling of 420175621 in words is "four hundred twenty million, one hundred seventy-five thousand, six hundred twenty-one".