421545101 has 4 divisors (see below), whose sum is σ = 421586304. Its totient is φ = 421503900.

The previous prime is 421545053. The next prime is 421545109. The reversal of 421545101 is 101545124.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 421545101 - 2¹⁰ = 421544077 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 (421545109) 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, 7766 + ... + 30056.

It is an arithmetic number, because the mean of its divisors is an integer number (105396576).

Almost surely, 2^421545101 is an apocalyptic number.

It is an amenable number.

421545101 is a deficient number, since it is larger than the sum of its proper divisors (41203).

421545101 is a wasteful number, since it uses less digits than its factorization.

421545101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41202.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 421545101 is about 20531.5635303306. The cubic root of 421545101 is about 749.8044533161.

Adding to 421545101 its sum of digits (23), we get a palindrome (421545124).

The spelling of 421545101 in words is "four hundred twenty-one million, five hundred forty-five thousand, one hundred one".