21002201191 has 16 divisors (see below), whose sum is σ = 22103746560. Its totient is φ = 19927683360.

The previous prime is 21002201179. The next prime is 21002201249. The reversal of 21002201191 is 19110220012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002201191 - 2⁵ = 21002201159 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 (21002201141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3083796 + ... + 3090598.

It is an arithmetic number, because the mean of its divisors is an integer number (1381484160).

Almost surely, 2^21002201191 is an apocalyptic number.

21002201191 is a deficient number, since it is larger than the sum of its proper divisors (1101545369).

21002201191 is a wasteful number, since it uses less digits than its factorization.

21002201191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21002201191 in words is "twenty-one billion, two million, two hundred one thousand, one hundred ninety-one".