421636051 has 4 divisors (see below), whose sum is σ = 421733992. Its totient is φ = 421538112.

The previous prime is 421636031. The next prime is 421636079. The reversal of 421636051 is 150636124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421636051 - 2¹⁵ = 421603283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421636031) 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, 42201 + ... + 51226.

It is an arithmetic number, because the mean of its divisors is an integer number (105433498).

Almost surely, 2^421636051 is an apocalyptic number.

421636051 is a deficient number, since it is larger than the sum of its proper divisors (97941).

421636051 is an equidigital number, since it uses as much as digits as its factorization.

421636051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97940.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 421636051 is about 20533.7782933390. The cubic root of 421636051 is about 749.8583738503.

The spelling of 421636051 in words is "four hundred twenty-one million, six hundred thirty-six thousand, fifty-one".