421640241 has 32 divisors (see below), whose sum is σ = 633650688. Its totient is φ = 247175040.

The previous prime is 421640227. The next prime is 421640291. The reversal of 421640241 is 142046124.

It is a happy number.

It is not a de Polignac number, because 421640241 - 2¹³ = 421632049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421640201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150445 + ... + 153221.

It is an arithmetic number, because the mean of its divisors is an integer number (19801584).

Almost surely, 2^421640241 is an apocalyptic number.

It is an amenable number.

421640241 is a deficient number, since it is larger than the sum of its proper divisors (212010447).

421640241 is a wasteful number, since it uses less digits than its factorization.

421640241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 421640241 is about 20533.8803200954. The cubic root of 421640241 is about 749.8608577431.

Adding to 421640241 its reverse (142046124), we get a palindrome (563686365).

The spelling of 421640241 in words is "four hundred twenty-one million, six hundred forty thousand, two hundred forty-one".