221231552542 has 64 divisors (see below), whose sum is σ = 464929403904. Its totient is φ = 76104483840.

The previous prime is 221231552501. The next prime is 221231552569. The reversal of 221231552542 is 245255132122.

It is a super-3 number, since 3×221231552542³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221231552498 and 221231552507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2356243 + ... + 2448334.

It is an arithmetic number, because the mean of its divisors is an integer number (7264521936).

Almost surely, 2^221231552542 is an apocalyptic number.

221231552542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221231552542 is an abundant number, since it is smaller than the sum of its proper divisors (243697851362).

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

221231552542 is a wasteful number, since it uses less digits than its factorization.

221231552542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804633.

The product of its digits is 48000, while the sum is 34.

Adding to 221231552542 its reverse (245255132122), we get a palindrome (466486684664).

The spelling of 221231552542 in words is "two hundred twenty-one billion, two hundred thirty-one million, five hundred fifty-two thousand, five hundred forty-two".