421221225055552 has 56 divisors (see below), whose sum is σ = 843681067560576. Its totient is φ = 208640207935488.

The previous prime is 421221225055489. The next prime is 421221225055567. The reversal of 421221225055552 is 255550522122124.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 421221225055499 and 421221225055508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864131448 + ... + 864618760.

It is an arithmetic number, because the mean of its divisors is an integer number (15065733349296).

Almost surely, 2^{421221225055552} is an apocalyptic number.

It is an amenable number.

421221225055552 is an abundant number, since it is smaller than the sum of its proper divisors (422459842505024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421221225055552 is a wasteful number, since it uses less digits than its factorization.

421221225055552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613655 (or 613645 counting only the distinct ones).

The product of its (nonzero) digits is 800000, while the sum is 43.

Adding to 421221225055552 its reverse (255550522122124), we get a palindrome (676771747177676).

The spelling of 421221225055552 in words is "four hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-five million, fifty-five thousand, five hundred fifty-two".