421225411521 has 16 divisors (see below), whose sum is σ = 586069739136. Its totient is φ = 268599720576.

The previous prime is 421225411507. The next prime is 421225411543. The reversal of 421225411521 is 125114522124.

It is not a de Polignac number, because 421225411521 - 2⁵ = 421225411489 is a prime.

It is a super-2 number, since 2×421225411521² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421225411561) 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, 3173341 + ... + 3303413.

It is an arithmetic number, because the mean of its divisors is an integer number (36629358696).

Almost surely, 2^421225411521 is an apocalyptic number.

It is an amenable number.

421225411521 is a deficient number, since it is larger than the sum of its proper divisors (164844327615).

421225411521 is a wasteful number, since it uses less digits than its factorization.

421225411521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177032.

The product of its digits is 6400, while the sum is 30.

Adding to 421225411521 its reverse (125114522124), we get a palindrome (546339933645).

The spelling of 421225411521 in words is "four hundred twenty-one billion, two hundred twenty-five million, four hundred eleven thousand, five hundred twenty-one".