221038396997 has 8 divisors (see below), whose sum is σ = 241155442080. Its totient is φ = 200925126160.

The previous prime is 221038396961. The next prime is 221038397009. The reversal of 221038396997 is 799693830122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221038396997 - 2⁸ = 221038396741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221038396927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820403 + ... + 1056000.

It is an arithmetic number, because the mean of its divisors is an integer number (30144430260).

Almost surely, 2^221038396997 is an apocalyptic number.

It is an amenable number.

221038396997 is a deficient number, since it is larger than the sum of its proper divisors (20117045083).

221038396997 is a wasteful number, since it uses less digits than its factorization.

221038396997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887123.

The product of its (nonzero) digits is 8817984, while the sum is 59.

The spelling of 221038396997 in words is "two hundred twenty-one billion, thirty-eight million, three hundred ninety-six thousand, nine hundred ninety-seven".