221201002197 has 32 divisors (see below), whose sum is σ = 375019151360. Its totient is φ = 126232182000.

The previous prime is 221201002153. The next prime is 221201002199. The reversal of 221201002197 is 791200102122.

It is not a de Polignac number, because 221201002197 - 2¹⁶ = 221200936661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 221201002197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201002199) 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, 637273 + ... + 921150.

It is an arithmetic number, because the mean of its divisors is an integer number (11719348480).

Almost surely, 2^221201002197 is an apocalyptic number.

221201002197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

221201002197 is a deficient number, since it is larger than the sum of its proper divisors (153818149163).

221201002197 is a wasteful number, since it uses less digits than its factorization.

221201002197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559190 (or 1559184 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The spelling of 221201002197 in words is "two hundred twenty-one billion, two hundred one million, two thousand, one hundred ninety-seven".