221442838497 has 32 divisors (see below), whose sum is σ = 337754457600. Its totient is φ = 143287138944.

The previous prime is 221442838471. The next prime is 221442838553. The reversal of 221442838497 is 794838244122.

221442838497 is a `hidden beast` number, since 2 + 2 + 144 + 2 + 8 + 3 + 8 + 497 = 666.

It is not a de Polignac number, because 221442838497 - 2⁸ = 221442838241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221442838417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137608 + ... + 679574.

It is an arithmetic number, because the mean of its divisors is an integer number (10554826800).

Almost surely, 2^221442838497 is an apocalyptic number.

221442838497 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

221442838497 is a deficient number, since it is larger than the sum of its proper divisors (116311619103).

221442838497 is a wasteful number, since it uses less digits than its factorization.

221442838497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542422 (or 542416 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 221442838497 in words is "two hundred twenty-one billion, four hundred forty-two million, eight hundred thirty-eight thousand, four hundred ninety-seven".