421623511 has 16 divisors (see below), whose sum is σ = 475766784. Its totient is φ = 371476864.

The previous prime is 421623493. The next prime is 421623539. The reversal of 421623511 is 115326124.

It is a happy number.

It is not a de Polignac number, because 421623511 - 2⁵ = 421623479 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 (421623551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6906 + ... + 29848.

It is an arithmetic number, because the mean of its divisors is an integer number (29735424).

Almost surely, 2^421623511 is an apocalyptic number.

421623511 is a deficient number, since it is larger than the sum of its proper divisors (54143273).

421623511 is a wasteful number, since it uses less digits than its factorization.

421623511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23030.

The product of its digits is 1440, while the sum is 25.

The square root of 421623511 is about 20533.4729405427. The cubic root of 421623511 is about 749.8509398582.

Adding to 421623511 its reverse (115326124), we get a palindrome (536949635).

The spelling of 421623511 in words is "four hundred twenty-one million, six hundred twenty-three thousand, five hundred eleven".