21003201197 has 4 divisors (see below), whose sum is σ = 22912583136. Its totient is φ = 19093819260.

The previous prime is 21003201169. The next prime is 21003201221. The reversal of 21003201197 is 79110230012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21003201197 - 2²⁰ = 21002152621 is a prime.

It is a super-2 number, since 2×21003201197² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003201137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954690953 + ... + 954690974.

It is an arithmetic number, because the mean of its divisors is an integer number (5728145784).

Almost surely, 2^21003201197 is an apocalyptic number.

It is an amenable number.

21003201197 is a deficient number, since it is larger than the sum of its proper divisors (1909381939).

21003201197 is a wasteful number, since it uses less digits than its factorization.

21003201197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909381938.

The product of its (nonzero) digits is 756, while the sum is 26.

The spelling of 21003201197 in words is "twenty-one billion, three million, two hundred one thousand, one hundred ninety-seven".