421121551511 has 4 divisors (see below), whose sum is σ = 421180646832. Its totient is φ = 421062456192.

The previous prime is 421121551463. The next prime is 421121551561. The reversal of 421121551511 is 115155121124.

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 421121551511 - 2²² = 421117357207 is a prime.

It is a super-2 number, since 2×421121551511² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421121551561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29536970 + ... + 29551223.

It is an arithmetic number, because the mean of its divisors is an integer number (105295161708).

Almost surely, 2^421121551511 is an apocalyptic number.

421121551511 is a deficient number, since it is larger than the sum of its proper divisors (59095321).

421121551511 is an equidigital number, since it uses as much as digits as its factorization.

421121551511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59095320.

The product of its digits is 2000, while the sum is 29.

Adding to 421121551511 its reverse (115155121124), we get a palindrome (536276672635).

The spelling of 421121551511 in words is "four hundred twenty-one billion, one hundred twenty-one million, five hundred fifty-one thousand, five hundred eleven".