221521455342 has 80 divisors (see below), whose sum is σ = 550675065600. Its totient is φ = 65989924560.

The previous prime is 221521455301. The next prime is 221521455367. The reversal of 221521455342 is 243554125122.

221521455342 is a `hidden beast` number, since 2 + 2 + 1 + 52 + 14 + 553 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 221521455297 and 221521455306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 948342 + ... + 1158617.

It is an arithmetic number, because the mean of its divisors is an integer number (6883438320).

Almost surely, 2^221521455342 is an apocalyptic number.

221521455342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221521455342 is an abundant number, since it is smaller than the sum of its proper divisors (329153610258).

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

221521455342 is a wasteful number, since it uses less digits than its factorization.

221521455342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107043 (or 2107034 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 221521455342 in words is "two hundred twenty-one billion, five hundred twenty-one million, four hundred fifty-five thousand, three hundred forty-two".